looking at this: https://github.com/NixOS/nixos-search/blob/main/flake-info/src/commands/nixpkgs_info.rs#L14
i thought... Wouldn't it be cool if you could do ``` guix dump -L my-guix-channel/ --json --filter=py ``` I know it's possible by writing Guix API code. And I know it's possible to slap a srfi-37 on it and ship it. I'm just being lazy and posting to guix-devel instead of taking the time to implement it. * DONE
