Set Conditional Formatting Colors Using JSON Theme

Hi dax  - Yes, I understand that I can manually select a color from a color palette set by a them for the Minimum, Center, and Maximum colors or type in a hex code.

My question is, can I set those Minimum, Center, and Maximum colors using a JSON theme, rather than having to manually select the color from a color palette each time? Also, the colors I want to select are different than the colors I have set in my color palette.