core/lib/tests/modules/shorthand-meta.nix

{ lib, ... }:
let
  inherit (lib) types mkOption;
in
{
  imports = [
    (
      { config, ... }:
      {
        options = {
          meta.foo = mkOption { type = types.listOf types.str; };
          result = mkOption { default = lib.concatStringsSep " " config.meta.foo; };
        };
      }
    )
    {
      meta.foo = [
        "one"
        "two"
      ];
    }
  ];
}