Rendering the chords in comments separately from the rest of the text in chord grid margins is definitely going to lead to some difficulty. I also don't support pango markup in comments in chord grids at the moment, so that's going to require even more changes. Then I would have to add more code to break up labels in the margins into parts (regular text + chords) and render each of those separately. So I would potentially need to change quite a bit of code.
Mike
Mike