If you’re using nix to setup gradle, then there are many ways to get
gradle setup, then the rest of the build would be standard. I see no
reason to tie a standard Android gradle build to any particular OS or
package manager.
If you’re doing other tricks with Nix, then you’ll be the pathfinder on
that one. All I’m saying is don’t expect things to just work with
non-standard Android build setups, and I wish you all the best with your
nix tricks.