If your “bio” contains a table like so, your username, on Hexbear, will appear as USERNAME [XXX/YYY]@lemmygrad.ml

|||
|---|---|
| Pronouns | XXX/YYY |

I haven’t looked at Hexbear’s source code, nor experimented further, so I don’t know what limitations there are, but I know you can add other rows to the table without breaking the feature.