Column types available for nested views are currently limited (only name, status and health). An extension point shall be added for nested view columns such that other plugin developers can implement new column types for nested views (similar like ListViewColumn).
Use case example:
I want to display textual information for the subviews of my nested view, for example a common contact person for all the jobs in that subview. To implement this an extension point for nested view columns is needed.
(this is my usecase, could think of many others)