[Accessibility] Qt Quick Controls 1.0 TreeView isn't accessible (hierarchy is flattened)

Qt Quick Controls 1.0 TreeView is implemented using a BasicTableView/ListView which simulates tree branches by adding indentation.

The problem with that is when running under Narrator/VoiceOver, the hierarchical information about the nodes is lost (child tree nodes need to show up as child acc nodes of their parent tree node in the acc tree)