[Python] How do I label unique polygon values in arcpy and store their colors?

I have a polygon layer with 10 features with unique IDs. I want to color them deterministically based on this unique ID values field and store the RGB values of their colors, like in a dictionary. This is in a ArcGIS Pro script/tool so it must be python and not manual. It should work for polygons of different numbers of features, making and storing a new color for each.

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