Yeah, I wouldn’t really expect them to, you can export sketches as .dwg files I know, but I don’t think that carries constraint and parameter data forward. From a little reading there is some development on a .f3d file importer for freecad.

Is there a cad tool that actually does contain that data in an interoperable way that a separate cad tool can import? Foss or otherwise?

I’m stuck with fusion for work, and like using it overall, but I do appreciate the concern over being tied into a software as a service work environment.