May I make a request for the inclusion of Hauptstimme and Nebenstimme (https://en.wikipedia.org/wiki/Hauptstimme)?
These are found in, eg, Berg’s Lyric Suite and Schoenberg string quartets
They do have Unicode equivalents and so, I guess, are in Bravura but inputting Unicode is a bit of a nuisance (unless it’s been improved since this post: https://www.steinberg.net/forums/viewtopic.php?f=246&t=115068&p=629211&hilit=unicode#p629211). They would need attaching to a note or rest but I don’t really know if they would count as playing technique, dynamic or just good old plain text. I guess the Dorico team have a style guide for this kind of thing…