For any kind of 3D export you would need to export the 3D mesh, textures, and shaders (and probably something I forgot) to have the same result as in DA. But that would mean you have to recreate DA within your Unity game.
The devs heard many times of the wish to export DA assets or maps to other 3D environments (Unity, Blender, TableTopSimulator,...), but how they started to write the code and create the assets was without having in mind to export 3D objects. Maybe they will change it in the future, but don't expect it to happen soon as it would need to many things to be altered.