I ran across this post on the Home Assistant forum, which shows something very similar to what I want to achieve. However, there is something that is unclear to me: with Snapdroid, will I able to stream all audio from my Android device to the Snapcast server so that it doesn't matter which app I use, or is this just some control device? I couldn't make that clearly out from the GitHub repo of Snapdroid.

My desired use case is to use this in the same way I would with AirPlay on an iPhone, and be able to use my music player connected to my Jellyfin server, my podcast application or my YouTube frontend application to play audio that is cast to the Snapcast server.