There is a dedicated system for Foundry VTT version 14 and later: personnel file, two-colour dice, all class trees, compendiums with ready-made agents, gear and 145 opponents, plus the Quickstart, Grey Files, The Door and The Other Services as adventure packs to import. Install it in Foundry under Game Systems → Install System with the manifest URL from the Virtual Tabletops page.
The Roll20 character sheet is finished and will be tested in the Roll20 sandbox before release. Characters from the character generator can be imported into both.