Yes — Songhub supports most of the ChordPro file format, including its directive syntax like {title: ...}, {key: ...} and {capo: ...}.
Chords can be written the standard ChordPro way, inline in square brackets in front of the lyric they change on, or on their own line above the lyrics.
On top of standard ChordPro, Songhub adds a few of its own directives — including Nashville number chord names and line-level text styling — documented on the Songhub docs page.