Are you a contributor? Is there a way to bring this up with the team? Perhaps a place to start would be to add support for storing OGC Simple Features and corresponding to/from conversion functions. I don’t have a lot of spare time, but may want to take a stab at a proof of concept if some developers could help orient me to the code.
DuckDB developer here - we absolutely welcome outside contributions. Feel free to open an issue or discussion on our github for a feature request, and we would be happy to point you in the right direction!