Here is an example using JSONata and a change node.
Your temp reading is in an array and does not have a object key. So to get the temps i had to work around the issue.
[{"id":"81cb466e.5f6f2","type":"inject","z":"c74669a0.6a34f8","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"{\"Devices-Detail-Response\":{\"$\":{\"xmlns\":\"http://www.embeddeddatasystems.com/schema/owserver\",\"xmlns:xsi\":\"http://www.w3.org/2001/XMLSchema-instance\"},\"PollCount\":[\"2038611\"],\"DevicesConnected\":[\"12\"],\"LoopTime\":[\"10.749\"],\"DataErrors\":[\"780\"],\"owd_DS18S20\":[{\"$\":{\"Description\":\"Parasite power thermometer\"},\"Name\":[\"DS18S20\"],\"Family\":[\"10\"],\"ROMId\":[\"BB00080172AD3010\"],\"Health\":[\"7\"],\"RawData\":[\"49004B46FFFF0210ED00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\"],\"PrimaryValue\":[\"36.5 Deg C\"],\"Temperature\":[{\"\":\"36.5\",\"$\":{\"Units\":\"Centigrade\"}}],\"UserByte1\":[{\"\":\"75\",\"$\":{\"Writable\":\"True\"}}],\"UserByte2\":[{\"\":\"70\",\"$\":{\"Writable\":\"True\"}}]},{\"$\":{\"Description\":\"Parasite power thermometer\"},\"Name\":[\"DS18S20\"],\"Family\":[\"10\"],\"ROMId\":[\"1200080172A1D810\"],\"Health\":[\"7\"],\"RawData\":[\"56004B46FFFF0A103500000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\"],\"PrimaryValue\":[\"43.0 Deg C\"],\"Temperature\":[{\"\":\"43.0\",\"$\":{\"Units\":\"Centigrade\"}}],\"UserByte1\":[{\"\":\"75\",\"$\":{\"Writable\":\"True\"}}],\"UserByte2\":[{\"\":\"70\",\"$\":{\"Writable\":\"True\"}}]},{\"$\":{\"Description\":\"Parasite power thermometer\"},\"Name\":[\"DS18S20\"],\"Family\":[\"10\"],\"ROMId\":[\"67000801CA106410\"],\"Health\":[\"7\"],\"RawData\":[\"88004B46FFFF0D106D00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\"],\"PrimaryValue\":[\"68.0 Deg C\"],\"Temperature\":[{\"\":\"68.0\",\"$\":{\"Units\":\"Centigrade\"}}],\"UserByte1\":[{\"\":\"75\",\"$\":{\"Writable\":\"True\"}}],\"UserByte2\":[{\"\":\"70\",\"$\":{\"Writable\":\"True\"}}]},{\"$\":{\"Description\":\"Parasite power thermometer\"},\"Name\":[\"DS18S20\"],\"Family\":[\"10\"],\"ROMId\":[\"5E00080172389410\"],\"Health\":[\"7\"],\"RawData\":[\"72004B46FFFF0F107700000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\"],\"PrimaryValue\":[\"57.0 Deg C\"],\"Temperature\":[{\"\":\"57.0\",\"$\":{\"Units\":\"Centigrade\"}}],\"UserByte1\":[{\"\":\"75\",\"$\":{\"Writable\":\"True\"}}],\"UserByte2\":[{\"\":\"70\",\"$\":{\"Writable\":\"True\"}}]},{\"$\":{\"Description\":\"Parasite power thermometer\"},\"Name\":[\"DS18S20\"],\"Family\":[\"10\"],\"ROMId\":[\"23000801729B9410\"],\"Health\":[\"7\"],\"RawData\":[\"70004B46FFFF0C10A400000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\"],\"PrimaryValue\":[\"56.0 Deg C\"],\"Temperature\":[{\"\":\"56.0\",\"$\":{\"Units\":\"Centigrade\"}}],\"UserByte1\":[{\"\":\"75\",\"$\":{\"Writable\":\"True\"}}],\"UserByte2\":[{\"\":\"70\",\"$\":{\"Writable\":\"True\"}}]},{\"$\":{\"Description\":\"Parasite power thermometer\"},\"Name\":[\"DS18S20\"],\"Family\":[\"10\"],\"ROMId\":[\"4F000801728D5A10\"],\"Health\":[\"7\"],\"RawData\":[\"84004B46FFFF09106900000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\"],\"PrimaryValue\":[\"66.0 Deg C\"],\"Temperature\":[{\"\":\"66.0\",\"$\":{\"Units\":\"Centigrade\"}}],\"UserByte1\":[{\"\":\"75\",\"$\":{\"Writable\":\"True\"}}],\"UserByte2\":[{\"\":\"70\",\"$\":{\"Writable\":\"True\"}}]},{\"$\":{\"Description\":\"Parasite power thermometer\"},\"Name\":[\"DS18S20\"],\"Family\":[\"10\"],\"ROMId\":[\"0500080172BEFE10\"],\"Health\":[\"7\"],\"RawData\":[\"86004B46FFFF0C101000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\"],\"PrimaryValue\":[\"67.0 Deg C\"],\"Temperature\":[{\"\":\"67.0\",\"$\":{\"Units\":\"Centigrade\"}}],\"UserByte1\":[{\"\":\"75\",\"$\":{\"Writable\":\"True\"}}],\"UserByte2\":[{\"\":\"70\",\"$\":{\"Writable\":\"True\"}}]},{\"$\":{\"Description\":\"Parasite power thermometer\"},\"Name\":[\"DS18S20\"],\"Family\":[\"10\"],\"ROMId\":[\"62000801CA204510\"],\"Health\":[\"7\"],\"RawData\":[\"89004B46FFFF06100D00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\"],\"PrimaryValue\":[\"68.5 Deg C\"],\"Temperature\":[{\"\":\"68.5\",\"$\":{\"Units\":\"Centigrade\"}}],\"UserByte1\":[{\"\":\"75\",\"$\":{\"Writable\":\"True\"}}],\"UserByte2\":[{\"\":\"70\",\"$\":{\"Writable\":\"True\"}}]},{\"$\":{\"Description\":\"Parasite power thermometer\"},\"Name\":[\"DS18S20\"],\"Family\":[\"10\"],\"ROMId\":[\"7A00080172AB1510\"],\"Health\":[\"7\"],\"RawData\":[\"3E004B46FFFF0910AB00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\"],\"PrimaryValue\":[\"31.0 Deg C\"],\"Temperature\":[{\"\":\"31.0\",\"$\":{\"Units\":\"Centigrade\"}}],\"UserByte1\":[{\"\":\"75\",\"$\":{\"Writable\":\"True\"}}],\"UserByte2\":[{\"\":\"70\",\"$\":{\"Writable\":\"True\"}}]},{\"$\":{\"Description\":\"Parasite power thermometer\"},\"Name\":[\"DS18S20\"],\"Family\":[\"10\"],\"ROMId\":[\"0C000801CA3B2D10\"],\"Health\":[\"7\"],\"RawData\":[\"6D004B46FFFF01100500000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\"],\"PrimaryValue\":[\"54.5 Deg C\"],\"Temperature\":[{\"\":\"54.5\",\"$\":{\"Units\":\"Centigrade\"}}],\"UserByte1\":[{\"\":\"75\",\"$\":{\"Writable\":\"True\"}}],\"UserByte2\":[{\"\":\"70\",\"$\":{\"Writable\":\"True\"}}]},{\"$\":{\"Description\":\"Parasite power thermometer\"},\"Name\":[\"DS18S20\"],\"Family\":[\"10\"],\"ROMId\":[\"17000801CA011710\"],\"Health\":[\"7\"],\"RawData\":[\"6C004B46FFFF09103000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\"],\"PrimaryValue\":[\"54.0 Deg C\"],\"Temperature\":[{\"\":\"54.0\",\"$\":{\"Units\":\"Centigrade\"}}],\"UserByte1\":[{\"\":\"75\",\"$\":{\"Writable\":\"True\"}}],\"UserByte2\":[{\"\":\"70\",\"$\":{\"Writable\":\"True\"}}]}],\"owd_DS2408\":[{\"$\":{\"Description\":\"8-Channel Addressable Switch\"},\"Name\":[\"DS2408\"],\"Family\":[\"29\"],\"ROMId\":[\"FA0000000C56E529\"],\"Health\":[\"7\"],\"RawData\":[\"8FFFFF00008000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\"],\"PrimaryValue\":[\"143\"],\"PIOLogicState\":[\"143\"],\"PIOOutputLatchState\":[{\"\":\"255\",\"$\":{\"Writable\":\"True\"}}],\"PIOActivityLatchState\":[{\"\":\"255\",\"$\":{\"Writable\":\"True\"}}],\"RSTZconfiguration\":[{\"\":\"0\",\"$\":{\"Writable\":\"True\"}}],\"PowerOnResetLatch\":[{\"_\":\"0\",\"$\":{\"Writable\":\"True\"}}],\"VccPowerStatus\":[\"1\"]}]}}","payloadType":"json","x":230,"y":980,"wires":[["5ca87b41.8332bc"]]},{"id":"5ca87b41.8332bc","type":"change","z":"c74669a0.6a34f8","name":"","rules":[{"t":"set","p":"payload","pt":"msg","to":"payload.`Devices-Detail-Response`.owd_DS18S20.{\"ROMId\": ROMId[0],\"Health\": Health[0], \"Temperature\": Temperature[0].*[0]}","tot":"jsonata"}],"action":"","property":"","from":"","to":"","reg":false,"x":460,"y":1060,"wires":[["68f1a316.5e352c","633b6cf4.123b84"]]},{"id":"68f1a316.5e352c","type":"debug","z":"c74669a0.6a34f8","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","statusVal":"","statusType":"auto","x":720,"y":1060,"wires":[]},{"id":"633b6cf4.123b84","type":"change","z":"c74669a0.6a34f8","name":"","rules":[{"t":"set","p":"payload","pt":"msg","to":"payload[ROMId=\"4F000801728D5A10\"].Temperature","tot":"jsonata"}],"action":"","property":"","from":"","to":"","reg":false,"x":570,"y":1120,"wires":[["6b5fdace.c11e8c"]]},{"id":"6b5fdace.c11e8c","type":"debug","z":"c74669a0.6a34f8","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","statusVal":"","statusType":"auto","x":790,"y":1120,"wires":[]}]
[edit] or if you want to have the ROMId as an object property. You can also convert the strings to integer or floats.
[{"id":"81cb466e.5f6f2","type":"inject","z":"c74669a0.6a34f8","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"{\"Devices-Detail-Response\":{\"$\":{\"xmlns\":\"http://www.embeddeddatasystems.com/schema/owserver\",\"xmlns:xsi\":\"http://www.w3.org/2001/XMLSchema-instance\"},\"PollCount\":[\"2038611\"],\"DevicesConnected\":[\"12\"],\"LoopTime\":[\"10.749\"],\"DataErrors\":[\"780\"],\"owd_DS18S20\":[{\"$\":{\"Description\":\"Parasite power thermometer\"},\"Name\":[\"DS18S20\"],\"Family\":[\"10\"],\"ROMId\":[\"BB00080172AD3010\"],\"Health\":[\"7\"],\"RawData\":[\"49004B46FFFF0210ED00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\"],\"PrimaryValue\":[\"36.5 Deg C\"],\"Temperature\":[{\"\":\"36.5\",\"$\":{\"Units\":\"Centigrade\"}}],\"UserByte1\":[{\"\":\"75\",\"$\":{\"Writable\":\"True\"}}],\"UserByte2\":[{\"\":\"70\",\"$\":{\"Writable\":\"True\"}}]},{\"$\":{\"Description\":\"Parasite power thermometer\"},\"Name\":[\"DS18S20\"],\"Family\":[\"10\"],\"ROMId\":[\"1200080172A1D810\"],\"Health\":[\"7\"],\"RawData\":[\"56004B46FFFF0A103500000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\"],\"PrimaryValue\":[\"43.0 Deg C\"],\"Temperature\":[{\"\":\"43.0\",\"$\":{\"Units\":\"Centigrade\"}}],\"UserByte1\":[{\"\":\"75\",\"$\":{\"Writable\":\"True\"}}],\"UserByte2\":[{\"\":\"70\",\"$\":{\"Writable\":\"True\"}}]},{\"$\":{\"Description\":\"Parasite power thermometer\"},\"Name\":[\"DS18S20\"],\"Family\":[\"10\"],\"ROMId\":[\"67000801CA106410\"],\"Health\":[\"7\"],\"RawData\":[\"88004B46FFFF0D106D00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\"],\"PrimaryValue\":[\"68.0 Deg C\"],\"Temperature\":[{\"\":\"68.0\",\"$\":{\"Units\":\"Centigrade\"}}],\"UserByte1\":[{\"\":\"75\",\"$\":{\"Writable\":\"True\"}}],\"UserByte2\":[{\"\":\"70\",\"$\":{\"Writable\":\"True\"}}]},{\"$\":{\"Description\":\"Parasite power thermometer\"},\"Name\":[\"DS18S20\"],\"Family\":[\"10\"],\"ROMId\":[\"5E00080172389410\"],\"Health\":[\"7\"],\"RawData\":[\"72004B46FFFF0F107700000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\"],\"PrimaryValue\":[\"57.0 Deg C\"],\"Temperature\":[{\"\":\"57.0\",\"$\":{\"Units\":\"Centigrade\"}}],\"UserByte1\":[{\"\":\"75\",\"$\":{\"Writable\":\"True\"}}],\"UserByte2\":[{\"\":\"70\",\"$\":{\"Writable\":\"True\"}}]},{\"$\":{\"Description\":\"Parasite power thermometer\"},\"Name\":[\"DS18S20\"],\"Family\":[\"10\"],\"ROMId\":[\"23000801729B9410\"],\"Health\":[\"7\"],\"RawData\":[\"70004B46FFFF0C10A400000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\"],\"PrimaryValue\":[\"56.0 Deg C\"],\"Temperature\":[{\"\":\"56.0\",\"$\":{\"Units\":\"Centigrade\"}}],\"UserByte1\":[{\"\":\"75\",\"$\":{\"Writable\":\"True\"}}],\"UserByte2\":[{\"\":\"70\",\"$\":{\"Writable\":\"True\"}}]},{\"$\":{\"Description\":\"Parasite power thermometer\"},\"Name\":[\"DS18S20\"],\"Family\":[\"10\"],\"ROMId\":[\"4F000801728D5A10\"],\"Health\":[\"7\"],\"RawData\":[\"84004B46FFFF09106900000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\"],\"PrimaryValue\":[\"66.0 Deg C\"],\"Temperature\":[{\"\":\"66.0\",\"$\":{\"Units\":\"Centigrade\"}}],\"UserByte1\":[{\"\":\"75\",\"$\":{\"Writable\":\"True\"}}],\"UserByte2\":[{\"\":\"70\",\"$\":{\"Writable\":\"True\"}}]},{\"$\":{\"Description\":\"Parasite power thermometer\"},\"Name\":[\"DS18S20\"],\"Family\":[\"10\"],\"ROMId\":[\"0500080172BEFE10\"],\"Health\":[\"7\"],\"RawData\":[\"86004B46FFFF0C101000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\"],\"PrimaryValue\":[\"67.0 Deg C\"],\"Temperature\":[{\"\":\"67.0\",\"$\":{\"Units\":\"Centigrade\"}}],\"UserByte1\":[{\"\":\"75\",\"$\":{\"Writable\":\"True\"}}],\"UserByte2\":[{\"\":\"70\",\"$\":{\"Writable\":\"True\"}}]},{\"$\":{\"Description\":\"Parasite power thermometer\"},\"Name\":[\"DS18S20\"],\"Family\":[\"10\"],\"ROMId\":[\"62000801CA204510\"],\"Health\":[\"7\"],\"RawData\":[\"89004B46FFFF06100D00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\"],\"PrimaryValue\":[\"68.5 Deg C\"],\"Temperature\":[{\"\":\"68.5\",\"$\":{\"Units\":\"Centigrade\"}}],\"UserByte1\":[{\"\":\"75\",\"$\":{\"Writable\":\"True\"}}],\"UserByte2\":[{\"\":\"70\",\"$\":{\"Writable\":\"True\"}}]},{\"$\":{\"Description\":\"Parasite power thermometer\"},\"Name\":[\"DS18S20\"],\"Family\":[\"10\"],\"ROMId\":[\"7A00080172AB1510\"],\"Health\":[\"7\"],\"RawData\":[\"3E004B46FFFF0910AB00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\"],\"PrimaryValue\":[\"31.0 Deg C\"],\"Temperature\":[{\"\":\"31.0\",\"$\":{\"Units\":\"Centigrade\"}}],\"UserByte1\":[{\"\":\"75\",\"$\":{\"Writable\":\"True\"}}],\"UserByte2\":[{\"\":\"70\",\"$\":{\"Writable\":\"True\"}}]},{\"$\":{\"Description\":\"Parasite power thermometer\"},\"Name\":[\"DS18S20\"],\"Family\":[\"10\"],\"ROMId\":[\"0C000801CA3B2D10\"],\"Health\":[\"7\"],\"RawData\":[\"6D004B46FFFF01100500000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\"],\"PrimaryValue\":[\"54.5 Deg C\"],\"Temperature\":[{\"\":\"54.5\",\"$\":{\"Units\":\"Centigrade\"}}],\"UserByte1\":[{\"\":\"75\",\"$\":{\"Writable\":\"True\"}}],\"UserByte2\":[{\"\":\"70\",\"$\":{\"Writable\":\"True\"}}]},{\"$\":{\"Description\":\"Parasite power thermometer\"},\"Name\":[\"DS18S20\"],\"Family\":[\"10\"],\"ROMId\":[\"17000801CA011710\"],\"Health\":[\"7\"],\"RawData\":[\"6C004B46FFFF09103000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\"],\"PrimaryValue\":[\"54.0 Deg C\"],\"Temperature\":[{\"\":\"54.0\",\"$\":{\"Units\":\"Centigrade\"}}],\"UserByte1\":[{\"\":\"75\",\"$\":{\"Writable\":\"True\"}}],\"UserByte2\":[{\"\":\"70\",\"$\":{\"Writable\":\"True\"}}]}],\"owd_DS2408\":[{\"$\":{\"Description\":\"8-Channel Addressable Switch\"},\"Name\":[\"DS2408\"],\"Family\":[\"29\"],\"ROMId\":[\"FA0000000C56E529\"],\"Health\":[\"7\"],\"RawData\":[\"8FFFFF00008000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000\"],\"PrimaryValue\":[\"143\"],\"PIOLogicState\":[\"143\"],\"PIOOutputLatchState\":[{\"\":\"255\",\"$\":{\"Writable\":\"True\"}}],\"PIOActivityLatchState\":[{\"\":\"255\",\"$\":{\"Writable\":\"True\"}}],\"RSTZconfiguration\":[{\"\":\"0\",\"$\":{\"Writable\":\"True\"}}],\"PowerOnResetLatch\":[{\"_\":\"0\",\"$\":{\"Writable\":\"True\"}}],\"VccPowerStatus\":[\"1\"]}]}}","payloadType":"json","x":230,"y":980,"wires":[["5ca87b41.8332bc"]]},{"id":"5ca87b41.8332bc","type":"change","z":"c74669a0.6a34f8","name":"","rules":[{"t":"set","p":"payload","pt":"msg","to":"payload.`Devices-Detail-Response`.owd_DS18S20.${\tROMId[0]:{\t\"Health\": $number(Health[0]), \t\"Temperature\": $number(Temperature[0].*[0]), \t\"Unit\": Temperature[0].*[1].Units}}","tot":"jsonata"}],"action":"","property":"","from":"","to":"","reg":false,"x":460,"y":1060,"wires":[["68f1a316.5e352c","633b6cf4.123b84"]]},{"id":"68f1a316.5e352c","type":"debug","z":"c74669a0.6a34f8","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","statusVal":"","statusType":"auto","x":720,"y":1060,"wires":[]},{"id":"633b6cf4.123b84","type":"change","z":"c74669a0.6a34f8","name":"","rules":[{"t":"set","p":"payload","pt":"msg","to":"payload.`4F000801728D5A10`.Temperature","tot":"jsonata"}],"action":"","property":"","from":"","to":"","reg":false,"x":570,"y":1120,"wires":[["6b5fdace.c11e8c"]]},{"id":"6b5fdace.c11e8c","type":"debug","z":"c74669a0.6a34f8","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","statusVal":"","statusType":"auto","x":790,"y":1120,"wires":[]}]