Changing request owner on trigger before save.

Hello. 

In the old Servicethere was an out of box functionality that when a user changes the status of a request to closed then she will automatically be set to the owner of the ticket. 

Is there a preference for this in the new Service module ? 

Even if there is, I would like to be able to manipulate this by using the Trigger before save on Service, but I'm not able to make it work. 

These are the input fields related to "OwnedBy" retrieved by the trigger on save button pressed: 

"TicketEntity.OwnedBy.AssociateId": "0",
  "TicketEntity.OwnedBy.Deleted": "false",
  "TicketEntity.OwnedBy.EjUserId": "0",
  "TicketEntity.OwnedBy.FormalName": "",
  "TicketEntity.OwnedBy.FullName": "(Unassigned)",
  "TicketEntity.OwnedBy.GroupIdx": "0",
  "TicketEntity.OwnedBy.Name": "",
  "TicketEntity.OwnedBy.PersonId": "0",
  "TicketEntity.OwnedBy.Rank": "0",
  "TicketEntity.OwnedBy.Tooltip": "",
  "TicketEntity.OwnedBy.Type": "Unknown",
  "TicketEntity.OwnedBy.UserName": "",

Ive tried to use ed.setOutputValue("TicketEntity.xx.xx") using everything from ejUserId to name and FormalName but it does not seem to work.
Isn't it at all possible to set ticketOwner from request before save trigger ? 

Also, I know that i can use the request after save trigger but then i would need to navigate away from the screen or refresh for the correct owner to show in the field.