FYI, As an ultimateguitar subscriber, I own the rights to the tabs/charts as part of my subscription. I can only expert the ones that belong to them. I believe they only export into .gpx (GuitarPro) format.
I think it would be helpful to be able to import lyrics and chords from other programs. It would streamline changing to your product.
There is an open format for export/import of charts in a .pro and .chopro file format. The format seems very similar to yours. https://en.wikipedia.org/wiki/ChordPro#:~:text=File%20extensions%20used%20for%20ChordPro,pro%2C%20.
I pasted a .chopro file into ST3 edit lyrics page and it mostly works. There are portions in {} that are not parsed though. It would be nice if you could hit '+' to create a new song and be able to import a .chopro file or even a GuitarPro .gpx format (which is a bit more complex but very useful). The metadata in the {} includes title, artist, BPM etc. It would be very handy.
I'm pretty new to ST3 but really like it. Maybe there is a trick to importing these formats I am not aware of.