How to change text color of Stream Deck button text with JSON

Hi, new user here and having great success with BTT and my Stream Deck, using the shell script wizard for dynamic button updates.

I've been successfully using SF Symbols, and changing icons based on the output of my scripts, e.g. "BTTStreamDeckSFSymbolName" to select the SF Symbol, and I can change the colors of these Icons just fine (e.g. "BTTStreamDeckIconColor1"), but I cannot figure out how to use the "BTTStreamDeckAttributedTitle" parameter to set the text color (e.g. the color of 'text': 'text_string'

Do I have to use some Apple tools to create the AttributedTitle string, or is there some easier way I'm overlooking?

Thanks!
-DDV