You need a character sheet on roll20! I would make one myself but I don't have a pro membership. This would be what I would prefer to play on there if I could. I haven't played this yet, but LOVE what I'm seeing. I was trying to make a similar game, but it already exists and it's even better!
I actually made the Knave 1e character sheet for Roll20 back in lockdown! Unfortunately I no longer have a pro membership either, since I rarely play on there anymore.
There are several good online FORGE character sheets floating around on the discord - both Google Sheets and form fillable pdf variants. These might be a good alternative for the time being? :)
(Apologies for the very belated response, I've been quite busy recently!)