try this, inject a color and watch into the Dashboard "Generale -> Test" group:
[{"id":"b305344b25b4adaf","type":"ui_template","z":"fd95058a.48e3e8","group":"f5dc3cef6c5ab80d","name":"","order":0,"width":0,"height":0,"format":"<p style=\"color: {{ msg.payload }}\"> test </p>","storeOutMessages":true,"fwdInMessages":true,"resendOnRefresh":true,"templateScope":"local","className":"","x":410,"y":1300,"wires":[[]]},{"id":"f4c502f1fcabc14a","type":"inject","z":"fd95058a.48e3e8","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"red","payloadType":"str","x":240,"y":1280,"wires":[["b305344b25b4adaf"]]},{"id":"cbc39f2172ab4269","type":"inject","z":"fd95058a.48e3e8","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"green","payloadType":"str","x":250,"y":1340,"wires":[["b305344b25b4adaf"]]},{"id":"f5dc3cef6c5ab80d","type":"ui_group","name":"Test","tab":"cb8604ed.917408","order":11,"disp":true,"width":"6","collapse":false,"className":""},{"id":"cb8604ed.917408","type":"ui_tab","name":"Generale","icon":"dashboard","order":1,"disabled":false,"hidden":false}]