How to set the RGB Widget's RGB start value?

I'm trying to set the RGB widget's touch position (that touch dot). I need to set its value via OSC. I have all the incoming values ready (RED = 255,0,0), but I do not know how to set this widget's value. I tried using the widget's setting for value to "255,0,0", "255 0 0", but nothing I try seems to set the widget's actual value to RED. Anyone know how to interact with this widget? I'm not trying to set CSS color. I need to set the touch/mouse/dot starting point to a specific color so that when change is made it is fluid and smooth.

Thanks in advance for your help.

A value with multiple items should be written as a javascript array :
[255, 0, 0]
Writing this in default will change the starting value (only when the session is loaded).

Thank you. This was exactly what I needed.