This is a preset for adding and downloading Apple Music tracks to your iTunes library: https://share.folivora.ai/sharedPreset/a1c03ee1-9554-438a-a3f4-7795b8e644c4
EDIT: Here's an updated version; the previous one treats tracks that haven't been added to the library as though they have when they're opened from the library tab. Also there's no tick anymore for 'added and downloaded' because it seemed superfluous.
add to library:
added and downloaded:
(now playing widget not included in the preset, it's just the default one included in BTT)