Looking at the chord pro specification (https://www.chordpro.org/chordpro/ChordP...tives.html), there is no sop keyword in the standard spec. Applications such as Chordle (https://www.chordle.com/help10/chordproformat) and OnSong (https://onsongapp.com/docs/features/formats/chordpro/) have added support for that directive, but it's definitely not standard. If users would like me to also add support for that, I can, but it may not be compatible with other apps if they move their file to another app.
Mike
Update:
Adding support for {sop: name} or {start_of_part: name} is not difficult, so I went ahead and did that. All it effectively does it bold the text in the "name" part of the directive.
Mike
Update:
Adding support for {sop: name} or {start_of_part: name} is not difficult, so I went ahead and did that. All it effectively does it bold the text in the "name" part of the directive.