Custom Color for Non-RFID spools in CFS?

I just hooked up a 3rd CFS to my K2 Plus. I have a mix of Creality RFID and spools from other vendors.
Now that I’ll have up to 12 spools at once I was wondering if there was an easier way to identify specialty filaments like gradient and rainbow? Even if there was a way to add a custom color pallette instead of just the basic 24 colors?

I have not seen a way to do this, but I think that it would be a good idea to add more to the list or allow custom colours. Also something for Transparent filaments.