Mapkit SwiftUI add Polygon with 'thickness'

I have viewed the WWDC video about MapKit in SwiftUI AWESOME! I want to work with that!

I noticed that you can view the map at an angle, so that you can for instance look under a bridge. I saw in the video that it is possible to add a MapPolygon. But when the MapView apparently has a 3rd dimension ... is it possible to add a MapPolygon with a certain thickness? Or perhaps let a MapPolygon only occupy space from say 10 to 20 meters high?

Thanks!! Wouter