Yes, both of those are already implemented for 4.0. (that includes importing them from Anki, at least with image files)
I am glad you are still supporting mac separately; I have an Android phone but a Mac laptop. I would love to be able to use Pleco with better posture.With iOS 14 you can kind of target both at the same time, so that’s what we’re doing (and were planning even without Apple Silicon).
So I think it’s almost certain that Apple will block non-Mac-notarized IPAs in a future release of macOS on ARM, and I wouldn’t get too comfortable using any iOS apps like this in the meantime