@kevin158 - interesting suggestion. This will essentially become possible with next iteration of Spectra AI which includes look transfer from images. While I don't have short-term plans for implementing hex codes directly into the app, you'll be able to drop in any color palette containing your desired colors as an image and spectra will transfer the look. Here are a few examples of Spectra 2.0 is able to do with zero manual adjustments:

I can't wait to try it out.
I hope this will outmatch " Match " Colors !

( I didn't really like match that's why didn't purchase it, i tested it. But i jumped on Colors instead. My use isn't really for Photography so maybe match wasn't for me. My test of it wasn't really positive. And colors was perfect for illustrations or paintings. ) ( pics linked )

I see the exemples for Spectra 2.0 and I know it's really Movie, clips, Photography oriented. And for i see it looks amazing. I'll gladly use the pick and transfer palette colors for some photography too. ^^

Thank you for answering. I Can't wait.