Pathbuilder has a functionality to export the character sheet as JSON. I think it would be great to be able to import it into Roll20 from the JSON.
I'd even be happy to write the mapping functionality from the JSON to the Roll20 character sheet or something, but I believe that in order to start that functionality it has to be added on the PF2e character sheet by Roll20 (this is what I was told by Paizo when I asked about this feature).