Disappointed to find this without any response still after two years. And I also don't have a solution.
I would like the same functionality (on the cloud solution).
My use case: Multiple dasbhboards, each filtering backlog items from the same project, but for each requesting business unit. Ideally each unit can prioritise their items through this dedicated dashboard. But...If they only could update the priority right in the dashboard...not have to open eacch item one by one to update the priority