There is a possible way for this by using NAA as input backend, but it’s not very comfortable with rate switching. Auto rate switching is only implemented by Jussi with RME ADI2 devices.
Without these devices you’ll have to switch the input stream according to the bitrate of the source manually. Which is not very comfortable if streaming playlists with bitrate change between the titles. But it’s possible, I’m using this feature.
You can read the thread on Roonlabs community: Using any audio source with HQPlayer - Spotify, Amazon, Apple Music, YouTube Music, Deezer, Soundcloud - HQ Player - Roon Labs Community
Regards
Dirk