Is it possible for the note card colour selector to be customised with my regularly used colours?

Is it possible for the note card colour selector to be customised with my regularly used colours?

I love Notebook. It has a few quirks, some completely harmless, and to be honest this is one of them, but it's so annoying. The problem I am facing is this: I have started making a habit out of colour-coding all my uni notes and to-do lists etc. across a multitude of apps. I get to my uni lecture, open up a note, prepare it by naming it my class name and today's date, then I'm almost ready to start note-taking. All I have to do is manually pick the rough hue and shade of the course colour every single time I start a new note

The palette that the app offers is essentially 6 different tones of white, yellow, pink and blue, none of which are my chosen colours (go figure). Rather than going to the colour picker every time and stuffing around in there for a colour that looks sort of similar to the others, is there an option to make some of these colours the ones I actually use on a regular basis? And before you say "change the colours": there aren't enough in the palette (that are distinguishable enough from one another) for the amount of classes I have to colour-code.

This is the smallest of my problems but I would love to know if there's a more convenient way to do this!