How can I set the bearing for an MKLookAroundSnapshot?

I would like to be able to specify the camera bearing for taking an MKLookAroundSnapshot. When I request a scene using MKLookAroundSceneRequest I can only specify a mapItem to look at or some coordinates. When I specify coordinates the camera bearing for the snapshot appears to be North. Is it possible to specify a bearing e.g. 45 degrees (North East)? The reason why I want to do this is so that the camera can be set to look along a road as a driver would see it.

How can I set the bearing for an MKLookAroundSnapshot?
 
 
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