Has anyone managed to get Krita G'MIC working with Nix?

Recently, I switched to NixOS and realised that there is no G'MIC plugin package for Krita.

There's this issue that was last active in October 2023.

I was wondering if anyone has managed to install this without using another package manager (such as Flatpak) or installing an AppImage manually, for system reproducibility, and I also don't wanna have two package managers in one system.

Ideally, there'd be a wrapper, so you could do something like:

{ pkgs, ... }: {
  programs.krita = {
    enable = true;
    gmic.enable = true;
    gmic.package = pkgs.krita.gmic-qt;
  };
}

Thoughts?

Related: is there some kind of guide on these program.<name> wrappers? What are they and where are they defined?