Adding all tracks from a playlist to Apple Music library

I want to add all the tracks from a playlist to my library (so that all my songs from a playlist can be listed in the 'songs' section).

I enabled the option 'Add Playlist Songs' later and now only the tracks that I add to the playlist NOW are being added to library, but now I want the older tracks to be there as well.

There is neither an option to select multiple tracks and add them to the library. Please help I have so much music that only pops up in playlists.

[Re-Titled by Moderator]

Original Title: Apple Music