Set color values using ANY DIGITAL METHOD (not the analog "wheel")

Holy hell I’m frustrated with the color wheel (in both versions of the app). I’m trying to get to plain simple primary color values in OEM Scenes and I’m having a horrible time - slight imprecision when setting up the scene it extremely noticeable on the light itself. I don’t want some random preset, I want to simply specify my color by name or by RGB value.

How can I accomplish precise color value control in the new app?