It would be great if it has the following features

Menu or Option to add lyrics content to the song
Menu or Option in json or any file to synchronize lyrics with song for every line or sentence which starts from
Menu or Option to have preset for music change
Menu or option to import local folders
support for old formats (.rm and .ram of real media player files)

Demos where lyrics can be synchronized with audio

Demo1: https://codepen.io/z-/pen/MQRGOe
Demo2: http://lusaisai.github.io/Lyricer/ (https://github.com/lusaisai/Lyricer)
Demo3: https://wafarifki.github.io/musicwithlyrics/ (https://github.com/wafarifki/musicwithlyrics)
Demo4: https://music.felixyeung.com/ (https://github.com/felixyeungdev/music.felixyeung.dev)
Demo5: https://guoyunhe.github.io/rabbit-lyrics/ (https://github.com/guoyunhe/rabbit-lyrics)