Exporting to other packages is only available in commercial versions of Houdini. Since smart assets are unique to Houdini, they cannot be exported as a whole. You can, however, configure and save out static models with specific settings.
For example, if you open the doors and turn the wheels in a car asset in Houdini and export the geometry, you will retain your changes but not be able to manipulate the parameters in another package. You can also save out a sequence of static frames and compile them into an animation.