Okay after messing around a bit I'm seeing that it having an issue adding all 3.1k songs to a play list, so this is not going to be as easy as I hoped for but can be done.
WARNING: [youtube:tab] YouTube Music is not directly supported. Redirecting to https://www.youtube.com/playlist?list=LM
WARNING: [youtube:tab] YouTube said: The playlist does not exist.
ERROR: [youtube:tab] LM: YouTube said: The playlist does not exist.
I do know that not all music.youtube likes get transfered to basic YouTube.
Oddly since I started using metrolist this weekend, my revanced version of yt musc broke. I get an error saying content is not available.