Here you can find the complete configuration of the slider component inside the software EVE Mananger Pro.

Topic Write:

Topic: shellies/shellyrgbw2-<device ID>/white/<n>/set

Js Parser:
var data = {
"mode":"white",
"brightness":Math.ceil(payload*100)
};
return JSON.stringify(data);



Topic responce:

Topic: shellies/shellyrgbw2-<device ID>/white/<n>/status

Js Parser:
var data = JSON.parse(payload);
return (data.brightness/100.0);