PyQt6 in Snaps

I’ve been trying to implement PyQt6 in my Python snap (which is currently running PyQt5) but I keep hitting problems. With my meager understanding of how snaps work, I’m unsure what the issue is.

PyQt5 snaps use this repo as a part (really not sure why exactly, but it appears to be necessary):

Does PyQt6 need something similar? And if so, could that same repo be updated to accommodate PyQt6? It appears to only handle 4-5 at present.