Here’s the not really legal way I have heard of

1. Get a Deezer trail and cancle the sub right after. Migrate your relevant playlists to Deezer.
2. Use Deemix to download the playlist any anything you are interested in in the quality you desire. Make sure the DL settings are also what you want. You can also use other tools to download from Qobuz.
3. (Optional) Use Musicbrainz to identify and tag your files with unique IDs. You can also use custom scripts to give the artist field seperate entries for every artist. Makes it more convenient then separation by a ; or something. You can use ChatGPT for the script.
4. (Still optional) Import the music to a Lidarr instance for better management and automatic naming. The IDs make this step easier. This allows you too track new or missing releases from artists.
5. Import to Navidrome.

The optional steps can be more involved and need a lot of manual work. Also, the migration to Deezer will have issues, it’s not perfect.

If you want lyrics, I recommend using LRCGET or importing to Jellyfin and using it’s lyric plugin to automatically download them that way. The app SongSync on android also allows downloading lyrics automatically and manually from a variety is sources, including Apple and Spotify.

As for a music player on android, I’m currents trying Symfonium. Not FOSS and actually paid, but so far it’s the best I have seen.