So I self host all my music via Plex and for some artists and albums Plex (via Plex pass I believe) pulls lyrics and can show you like Spotify etc but some artists are not supported/popular. I found a couple apps that ‘worked’ to download lyrics but the best one was this https://github.com/tranxuanthang/lrcget

Just thought I would share for others who would want to do the same I have a large library and adding lyrics was not hard at all and found most out of the gate. If you have other solutions I would love to hear about them maybe they are better lol

It adds the file as same name in same folder that song is located