i use Musicolet as music player. It can export playlists in 2 ways. As m3u file but also to Android Mediastorage. And the last method i use makes the playlist directly be seen in CrossDJ in the playlist tab
So if you prefer to use another audio player maybe it's possible to use Musicolet to import your m3u file and export with Musicolet to Android Mediastorage.