macOS of course has an Extensions control panel in the System Preferences,
so it is clearly possible to make sharing extensions that appear somewhere. But not all of the sharing options that appear in Music are in the Extensions control panel:
and those that do are very generic, so it’s not clear to me whether I can extend the sharing options in Music or not. Additionally, most of the extensions in the “Share Menu” category are not appearing in Music.app’s “Sharing” menu.
Is it possible to write an extension that will appear in the Sharing menu in the Apple Music app?