I saw a docu about building Snapcraft /snap images with nixos
https://gsc.io/70266391-48a6-49be-ab5d-acb5d7f17e76-nixpkgs/doc/nixpkgs-manual/html/sec-pkgs-snapTools.html
They talk about the command
snap install ./result --dangerous. nix-example-firefox
How to get snap available/installed on nixos?