[sciurius]

Unfortunately OP didn't mention which tool he uses -- it would be interesting to know whether it works by means of a ChordPro directive or a program setting. Personally I think it is the latter.

In my opinion, ChordPro describes (or should describe) logical structure (songline, chord, verse, chorus, etc.), and should avoid appearance details as much as possible. How the song will look like is dealt with by the viewer programs. This is similar to HTML, where the appearance is defined by external style sheets. Both HTML and ChordPro have legacy issues (e.g. HTML has <B> and <I>; ChordPro has directives like {chordfont} and {textcolor}), but let's not create more of those.

So I am strongly inclined to think this should really belong to the MSPro text display settings.

Having said that, there's always the possibility to use proprietary directives, e.g. {x_mspro_chorus_color}.
https://www.chordpro.org/chordpro/ChordP...extensions