You can already use it with git-annex to store binaries using the git-annex-remote-git-aafs[1] special remote.
Although I would be careful and make sure you understand what it is doing to your branch namespace. Even though in the worst case it would not save any space over directly committing binaries, they are in orphan branches that can be pruned without rewriting history.
But even so, you can just use any number of git-annex special remotes to bypass using git for sharing files.
They may eventually add first-party support for git-annex. But nothing is stopping you from using it now.
For example, if I use Radicle to version a machine learning project, can I use a Magnet link for multi-GB model files?