How big is that array of data ?
My simplistic way to handle that would be to use a split node to create multiple separate messages. Then use a change node to set msg.timestamp to the msg.payload.Timestamp - then split the objects again to get the piece parts, then feed to a switch to separate them into groups or whatever... as I assume they can't all be charted...
Something like this to get you started...
[{"id":"6d769f11.3fec5","type":"inject","z":"a3c2a16b.fa113","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"","payloadType":"date","x":120,"y":1300,"wires":[["99f3bbf0.ddd0d8"]]},{"id":"99f3bbf0.ddd0d8","type":"function","z":"a3c2a16b.fa113","name":"","func":"msg.payload = [\n {\n \"Timestamp\": \"2020-06-01;13:50:56\",\n \"Temperature Terre Gauche\": \"255\",\n \"Temperature Terre Droite\": \"255\",\n \"Humidite Terre Gauche\": \"8%\",\n \"Humidite Terre Droite\": \"8%\",\n \"Temperature Air\": \"25.03\",\n \"Pression Atmo\": \"991.8483823706332\",\n \"Humidite Relative\": \"42.66742746470172\",\n \"Vitesse Vent\": \"25\",\n \"Direction Vent\": \"NO\",\n \"Pluie\": \"Raining\"\n },\n {\n \"Timestamp\": \"2020-06-01;13:50:57\",\n \"Temperature Terre Gauche\": \"255\",\n \"Temperature Terre Droite\": \"255\",\n \"Humidite Terre Gauche\": \"8%\",\n \"Humidite Terre Droite\": \"8%\",\n \"Temperature Air\": \"25.06\",\n \"Pression Atmo\": \"991.8648711222133\",\n \"Humidite Relative\": \"42.66744387693944\",\n \"Vitesse Vent\": \"25\",\n \"Direction Vent\": \"NO\",\n \"Pluie\": \"Raining\"\n }\n ]\nreturn msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","x":270,"y":1300,"wires":[["cd3b127f.fb703"]]},{"id":"cd3b127f.fb703","type":"split","z":"a3c2a16b.fa113","name":"","splt":"\\n","spltType":"str","arraySplt":1,"arraySpltType":"len","stream":false,"addname":"","x":410,"y":1300,"wires":[["a14f4fc5.ab7fe"]]},{"id":"a14f4fc5.ab7fe","type":"change","z":"a3c2a16b.fa113","name":"","rules":[{"t":"set","p":"timestamp","pt":"msg","to":"payload.Timestamp","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":570,"y":1300,"wires":[["24debbf5.1ccb14"]]},{"id":"24debbf5.1ccb14","type":"split","z":"a3c2a16b.fa113","name":"","splt":"\\n","spltType":"str","arraySplt":1,"arraySpltType":"len","stream":false,"addname":"topic","x":750,"y":1300,"wires":[["2921c0f5.7d8d4","4b4d1add.0056e4"]]},{"id":"2921c0f5.7d8d4","type":"debug","z":"a3c2a16b.fa113","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","statusVal":"","statusType":"auto","x":890,"y":1300,"wires":[]},{"id":"4b4d1add.0056e4","type":"switch","z":"a3c2a16b.fa113","name":"","property":"topic","propertyType":"msg","rules":[{"t":"cont","v":"Temperature","vt":"str"},{"t":"cont","v":"Humidite","vt":"str"},{"t":"else"}],"checkall":"true","repair":false,"outputs":3,"x":700,"y":1400,"wires":[["7c06cf8e.dfe3b"],["8e2a22aa.7999e"],[]]},{"id":"7c06cf8e.dfe3b","type":"ui_chart","z":"a3c2a16b.fa113","name":"","group":"298d0e23.9e2842","order":1,"width":"12","height":"7","label":"Temperature","chartType":"line","legend":"true","xformat":"HH:mm:ss","interpolate":"linear","nodata":"","dot":false,"ymin":"","ymax":"","removeOlder":1,"removeOlderPoints":"","removeOlderUnit":"3600","cutout":0,"useOneColor":false,"useUTC":false,"colors":["#1f77b4","#aec7e8","#ff7f0e","#2ca02c","#98df8a","#d62728","#ff9896","#9467bd","#c5b0d5"],"useOldStyle":false,"outputs":1,"x":890,"y":1360,"wires":[[]]},{"id":"8e2a22aa.7999e","type":"ui_chart","z":"a3c2a16b.fa113","name":"","group":"298d0e23.9e2842","order":1,"width":"12","height":"7","label":"Humidite","chartType":"line","legend":"true","xformat":"HH:mm:ss","interpolate":"linear","nodata":"","dot":false,"ymin":"","ymax":"","removeOlder":1,"removeOlderPoints":"","removeOlderUnit":"3600","cutout":0,"useOneColor":false,"useUTC":false,"colors":["#1f77b4","#aec7e8","#ff7f0e","#2ca02c","#98df8a","#d62728","#ff9896","#9467bd","#c5b0d5"],"useOldStyle":false,"outputs":1,"x":880,"y":1400,"wires":[[]]},{"id":"298d0e23.9e2842","type":"ui_group","z":"","name":"Group 1","tab":"38bc7756.d46238","order":1,"disp":true,"width":"12","collapse":false},{"id":"38bc7756.d46238","type":"ui_tab","name":"Tab 3","icon":"dashboard","order":1}]