unity – Export GameObject to IFC file format

I have some max model objects (fbx) and some primitive unit objects. A user can see it in a unit player. Now I want to provide a function to the end user so that he can export the game object from the unit to the IFC file format. As I mainly have the object related to the architecture (such as building, floor or wall, etc.), these objects must be exportable to the IFC file format, which is the file format of the Industry Foundation Classes (IFC) , maintained by buildingSMART®.