Currently only buildings and city walls are exported. I'm planning to fix it in the future ("for completeness"), but actually everything else is flat there, so I don't why would anybody need it :)
I agree with Felipe. Having everything exported would be excellent and a great time saver when trying to recreate and add details to any kind of settlement in, for example, Blender. And yes, I know it is also possible to import a PNG to use as a ground map for the placement of things, but having everyting as 3D objects would be awesome. Having said that, I totally get that time is a resource and you probably have other things to do that you find more interesting!
I think all these random generators you have done are amazing and thank you for making them available to those of us that do not have the skills to create such utilities.