Subsonic servers, such as navidrome, offer the ability to “SyncPlayQueue” via api to specific players, but in the case of navidrome that does not included the web player or music assistant for home assistant (the later is an assumption as i was unable to find a setting to enable it).
Have you tried Funkwhale? I think it supports the Subsonic API, but not sure if that specific feature is included.
Well, there was supposed to be the new PineCam from Pine64, but apparently it was never released?