MAC Download From YouTube Music (Premium)

This may be a basic question but... Anyone know how (and IF it is possible) to download YouTube music downloads from YouTube onto my MAC so I can add to the Apple music library (I do miss iTunes!)? I do pay for Premium and maybe mistakenly understood I could do this. I am reluctant to take random advice on Google about software etc. - definitely want to avoid any malware or issues on the MAC. As such, thought it was best to ask, especially as MACs always have their own way of doing things.

Thanks so much!