[punkypangolin]

How about copy/paste the lyrics into a new text or ChordPro file and annotate on that?

Unless I'm wrong on this as well, if you do a ChordPro file, you can't do any other files. I'll often have a chart and a lyrics file, and then need to add handwritten annotations around the lyrics. (ChordPro files allowing the text to change size and go columnar is super neat but also gets really weird with annotations.)

So I don't think that'd work, but I might be misunderstanding what you mean. Always open to trying new things though