[itsme]

It's correct that ChordPro files cannot be combined with other file types in the same song.
In setlists, collections and so on MobileSheets can handle a mix of all supported file types.
And yes, when the formatting of a ChordPro song is changed you might be facing issues with the position of annotations.
I frequently use ChordPro and in case I use sophisticated ChordPro features I create PDFs with the ChordPro reference implementation 
https://github.com/ChordPro/chordpro/releases/
A great relatively new feature is the support of ABC sections within ChordPro files
https://www.chordpro.org/beta/directives-env_abc/
Lots of interesting features but by far not as simple as the workflow I described earlier in this thread. And with PDF export the possibility to transpose with a few clicks within MobileSheets is lost.

I hope that the announced support of chord grids and lowercase chord letters in MobileSheets is coming soon. Supporting ABC within ChordPro files also by MobileSheets would be a real game changer but is probably more complicated.