using dnf bundles? (@cosmic-desktop-environment)

https://copr.fedorainfracloud.org/coprs/ryanabx/cosmic-epoch/
the "correct" way to use a tagged release of installing the cosmic desktop environment right now is something I'd never heard of before, in a non-ostree environment it'd be dnf install @cosmic-desktop-environment a "bundle" of packages I guess? On my first attempt to do this as a plain ol' rpm-ostree package I got
 × Recipe ./recipes/DX-GTS.yml failed to validate
  ╰─▶ 
        × Failed to deserialize recipe ./recipes/DX-GTS.yml
        ╰─▶ found character that cannot start any token at line 27 column 9,
      while
            scanning for the next token
      
  help: Use `bluebuild validate --all-errors ./recipes/DX-GTS.yml` to view
        more information.
        If you're using a local module, be sure to add `source: local` to the
        module entry

Is this an unsupported feature at the moment? Is it a thing introduced in 41 that isn't quite trickled down to ostree? Sorry if this has been covered, sadly bluebuild has "just worked" for about a year now on my own local gitea instance, and therefore I kinda stepped away from the community. It broke (my local setup, not bluebuild's fault) so I figured moving back to github would be preferrable, and figured I'd update a lot of things too.
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