Can the assignee of a sub-task be included in the assignee list of a Kanban board?

[joechiazza]

A Kanban board by default provides a drop down list of "Assignee", obviously based on the assignee of each ticket on the board.  However, if the ticket is a parent for one or more sub-tasks then these sub-tasks can have assignees that are different to the assignee of the parent ticket. 

Unfortunately the drop down list only shows the Assignee of the parent ticket.  Is there a way of the having all assignees, of both parent ticket and sub-tasks, in the drop down list?

[Sibylle]

I have exactly the same issue. Did anyone find a solution for this problem yet?