This is certainly something I'd like to support, but it's incredibly tedious to implement because there is no way to draw part of the chord as superscript without explicitly separating out that part and changing the font size and placement before rendering it (meaning additional measurements have to be done to figure this all out). This slows down the processing (and rendering but to a lesser extent), and I would need to rework some of the chord code to figure out exactly what parts should be rendered as superscript and store that separately, and then update all the rendering code to render each part of the chord independently. A better solution would be for me to support a different chord font that inherently supports the superscript characters without having to actually use superscript (although I then need to use different characters to represent the superscript parts of the chord so that it's rendered as expected). So that's something I may look into as well, as it would be simpler in many ways to implement and faster to process and render.
Mike
Mike