For Raspberry Pi and Tidal I use Volumio on the Pi and Bubble UPNP to send Tidal to it (it can also do the same with your plex library). The full version costs a couple of quid but works nicely to send a whole variety of stuff to a whole variety of other stuff.
No. It's a standalone app that basically takes your various music libraries (plex, tidal, local files, network, dropbox, etc) and "casts" it to various devices using different protocols (google cast, UPNP/DLNA, etc).
It's not a beautiful interface but it has a lot of functionality.
For Raspberry Pi and Tidal I use Volumio on the Pi and Bubble UPNP to send Tidal to it (it can also do the same with your plex library). The full version costs a couple of quid but works nicely to send a whole variety of stuff to a whole variety of other stuff.