https://milovana.com/forum/viewtopic.php?t=24040&hilit=funscript+generator
Funscript generator does exactly this.
https://discuss.eroscripts.com/t/funscriptdancer-generate-funscripts-from-music-beat-pitch-energy-cross-platform/73179
Funscript dancer might do this, or it might only work with videos I haven’t test it out for mp3. I would recommend this one if it does work as it have better results.