There isn't a way for a Requester Supervisor to view their direct reports submitted Incidents in Portal View
Have suggested reports for Requesters. Many like to see all the request for the year or month to show the work or issues they have had and reported.
This is a huge issue for us, as well! @rmena our current work around, if you didn't know, is to have the requester CC their supervisor in the incident request, and have the agents check the CC and update it if the requester forgot to do it. Read permissions need to be scoped for CC'd. Not great, but it works.