It looks like recent versions of LilyPond added \textMark and \textEndMark commands, perhaps to better dedicate \mark to rehearsal marks. Not clear whether it will be better to added abjad.TextMark, abjad.TextMarkEnd classes or abjad.Mark.text, abjad.Mark.end_text properties.
The underlying LilyPond command is
\mark.It looks like recent versions of LilyPond added
\textMarkand\textEndMarkcommands, perhaps to better dedicate\markto rehearsal marks. Not clear whether it will be better to addedabjad.TextMark,abjad.TextMarkEndclasses orabjad.Mark.text,abjad.Mark.end_textproperties.