Creating Nashville Number Formatted Charts with Dorico

Other ideas for anyone coming to this thread.

Zero line (no staff, stave lines)

Perhaps where there are notated rhythms, you could either use cues (or a separate instrument)

Chord symbols to numbers

Inputting horizontal lines
You presumably would have to insert the underlines for more than one “chord” number in a bar yourself. (Perhaps there is a way to do it using lyrics, or Playing technique?)

Playing techniques
Create them for the various symbols you need to use or at least use Text (Shift-X).