I imagine that when they release support for non-pixel Android phones it will basically be supported on all non-pixel Android phones at that point (provided they meet some kind of minimum requirements of Android version, likely). I think it's just a matter of waiting for you.
From Feb 20 on the support for more devices is rolled out: see here in the Community post.
Unfortunately I can see a lot of Samsung devices there, but the Galaxy Fold is still not mentioned there. I would give it another try though, maybe it works anyway?