Hope this is what you are looking for?
The Inject Node:
The Call Service Node:
[{"id":"7a74401a.9e28a","type":"inject","z":"38357f6c.c283b","name":"","props":[{"p":"domain","v":"light","vt":"str"},{"p":"service","v":"turn_on","vt":"str"},{"p":"entity","v":"light.dimmable_light_3","vt":"str"},{"p":"data","v":"100","vt":"json"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","x":1058,"y":1696,"wires":[["d31b2d54.5af88"]]},{"id":"d31b2d54.5af88","type":"api-call-service","z":"38357f6c.c283b","name":"Empty","server":"32f2c474.d2eeec","version":3,"debugenabled":false,"service_domain":"{{domain}}","service":"{{service}}","entityId":"{{entity}}","data":"{"brightness_pct":"{{data}}"}","dataType":"json","mergecontext":"","mustacheAltTags":false,"outputProperties":,"queue":"none","x":1266,"y":1696,"wires":[]},{"id":"32f2c474.d2eeec","type":"server","name":"Home Assistant","version":1,"legacy":false,"addon":false,"rejectUnauthorizedCerts":false,"ha_boolean":"y|yes|true|on|home|open","connectionDelay":true,"cacheJson":true}]