Task counts for users that are no longer with the company

Is there a way to just get counts of tasks (completed/incomplete) that were assigned to a previous user(s)? I don’t want to have to have support generate a hidden/private project (per employee) as I literally only need a full count of complete/incomplete assigned tasks to a select set of former employees which I can use their email associated with asana to identify. I find it kind of frustrating that there isn’t an easier way to do this.