You can specify a css class at runtime in msg.className. You can set css style in a ui-template node. You can then send different className to change to different style
Here is simple example which you can expand on.
[{"id":"7e9186040977be26","type":"ui_text","z":"b9860b4b9de8c8da","group":"8b5cde76.edd58","order":3,"width":0,"height":0,"name":"","label":"{{msg.payload}}","format":"{{msg.payload}}","layout":"row-spread","className":"","style":false,"font":"","fontSize":16,"color":"#000000","x":570,"y":200,"wires":[]},{"id":"aae5337bee8f059c","type":"ui_template","z":"b9860b4b9de8c8da","group":"4f791fdc1745d3d9","name":"","order":2,"width":0,"height":0,"format":"<style>\n .my_label_red {\n color: red !important;\n}\n.my_label_blue {\n color: blue !important;\n}\n</style>","storeOutMessages":true,"fwdInMessages":true,"resendOnRefresh":true,"templateScope":"global","className":"","x":540,"y":120,"wires":[[]]},{"id":"2093f740c739282a","type":"inject","z":"b9860b4b9de8c8da","name":"red","props":[{"p":"className","v":"my_label_red","vt":"str"},{"p":"payload"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"red","payloadType":"str","x":390,"y":200,"wires":[["7e9186040977be26"]]},{"id":"6a309898c6f8b851","type":"inject","z":"b9860b4b9de8c8da","name":"blue","props":[{"p":"className","v":"my_label_blue","vt":"str"},{"p":"payload"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"blue","payloadType":"str","x":390,"y":260,"wires":[["7e9186040977be26"]]},{"id":"8b5cde76.edd58","type":"ui_group","name":"default","tab":"8f03e639.85956","order":1,"disp":false,"width":"12","collapse":false},{"id":"4f791fdc1745d3d9","type":"ui_group","name":"micro","tab":"c954274bbed7292e","order":1,"disp":false,"width":"18","collapse":false,"className":""},{"id":"8f03e639.85956","type":"ui_tab","name":"Home","icon":"dashboard","order":3,"disabled":false,"hidden":false},{"id":"c954274bbed7292e","type":"ui_tab","name":"Solar","icon":"dashboard","order":1,"disabled":false,"hidden":false}]
