you can create them with a little programming knowledge there's a folder called lyric_parsers in the Now Playing script folder you'll find examples there
the script will auto load any file in there, just make sure you follow the correct lyric file syntax
eg
custom.lyrics.js
code:
var name = "custom lyrics"; //name shown
var className = "lp_custom"; //the object name
var lp_custom = function(){}
lp_custom.prototype = {
"getList" : function(title, artist, callback){
/*do whatever you have to do with the title and artist, then call the callback and pass an array of objects with the format of
{id : "", artist : "", title : ""}
*/
},
getLyrics : function(id, callback){
/*
id is the id you provide in the above function
once you get the lyrics, call the callback with the lyrics as a string
*/
}
}