apparently it's being worked on github.com/pop-os/xdg-d...
Implement org.freedesktop.impl.portal.Background by FreddyFunk · Pull Request #326 · pop-os/xdg-desktop-portal-cosmicCloses #49.
Implements the COSMIC backend for org.freedesktop.impl.portal.Background. Based on #70
Added on top of #70:
Rebase to latest master and resolve merge conflicts
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