Playlist import (m3u)

[M1scer]

I have playlists (m3u) next to my mp3 tracks. Now I would like to update the playlists when importing the entire folder.
My songs are imported by beets (beet import -g /source) and the tracks are then sorted by artist and album ({artist}/{album}/song.mp3)
Now I want the existing m3u file to be imported in such a way that it corresponds to the new paths of the songs and is copied into the directory folder.
This would then look like this in the m3u file.
Before:
song,mp3
song2.mp3
...

After
artist1/album/song.mp3
artist2/album/song2.mp3
...

I have a mixed music collection (already with metadata) so I would like to be able to use -g or -s as options.

Is there an easy way to achieve this?