Migrating Mac to iOS - recursively add folder to playlist?

As title suggests, I’m moving my setup from Macbook to ipad (air, 4th gen).

I know the recommendation is to use Apple Music to manage music and playlists but that’s not an option for me because it refuses to copy over large parts of my library (all legitimately purchased I hasten to add!).

So instead I’ve copied the files manually to the ipad, I can see the folder in Djay Pro and I want to add all the music in this folder (which has a mass of sub folders) to my Collection. I can see how to add all the music files in one folder, but that would require all my music to be in one folder, instead of the hundreds of folders it’s currently organised in.

Is there a way to recursively add all the music in a folder and every sub-folder to the Collection or do I have to dump all the files in a single folder first?

Thanks