Mapping MR experiences to separate rooms

As I understand it, if I wanted a different mixed reality experience to happen depending on which room Im in - this is not possible right now?

For context, Im wondering about mapping out an area, importing into Unity and then when the user is in a certain area X will happen. I suppose ARFoundation could be leveraged somehow to recognise a marker and play an experience, but wanted to be sure its not possible to pre-map an area and have MR perform like a traditional 'level' would.