Virtual RGB+Dimmer Switch?

I’m trying to control a set of RGB LEDs connected to a nodeMCU board, and to accomplish this I’d like to use a virtual switch that is capable of RGB and Dimming. I tried a virtual Hue bulb, but it didn’t work well.

Do templates for these exist somewhere, or am I left learning Groovy? What I would like is a switch that outputs numeric dimmer level and RGB values for color.

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