Hi Katarina - Welcome to the Atlassian Community!
You should should able to just type the username for the person even through the prompt doesn't show up. So something like:
created > startOfWeek() AND assignee changed BY john.funk and assignee was currentuser() and assignee = currentuser() and status = 'to do'
Go ahead and type in the username and see if you get an error.
Hello Community members! We’re wrapping up the end of JSM June with an Ask Me Anything (AMA) with the Jira Service Management product team. This is your chance to ask all your ITSM questions to o...
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event
You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events