Design an easy way to get the LICENSE of a nix package

[hofbi]

Is your feature request related to a problem? Please describe.
I have to know and access the lincesnes of all my dependencies. If I include them via bazel directly, I can get this easily from the github repo. But for dependencies that come from nix, it don't see the source code repo

Describe the solution you'd like
For nixpkgs_package, it would be great to have an easy way to get the LICENSE of the respective nix package being used

Describe alternatives you've considered
Some initial websearch brought me to https://nixos.wiki/wiki/Nix_Cookbook#License_stance and https://github.com/NixOS/nixpkgs/blob/master/lib/licenses.nix but so far I am not 100% how to solve this

[malt3]

I think this is a great idea!
Bazel is slowly standardizing how licenses are attached to targets.
The current progress is shown in rules_license, which might be split up into smaller modules.

I think we could try to take the LICENSE from nix and stick it into REPO.bazel:

repo(
    default_package_metadata = ["//:my_license"],
)