How to use more color in ColorChannel?

I want to use more different color in ColorChannel but there using only constant colors like Red, Green and Blue. It is possible set RGB value in place of color channel. I have trying to much but it is not accept RGB value into the ColorChannel. 

I have to make change color using Color Picker and select RGB value and set to color of PCB in built LED.

So can you please suggest me how it is possible.



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