Add area path and iteration path mapping

[HengjieWang]

If the area path not existing to target project, can we not just migrate all of them to "default-area-path", provide some mapping options?

For example:
In configuration.json, the "default-area-path": A
In source project, the area path list is {B, C, D}
In target project, the area path list is {A, B, E}

Is it possibility to migrate the area path with the relation B -> B, C -> E, D -> A?