You get a new search option in advance filter, while you are in subitem view of scrum board or kanban board. You can now filter all your required subitem with Created By or Reported by option easily.

There is a new label in subitem pop up which helps you to identify that the subitem is created by whom.

We are working on many exciting enhancements to strengthen your internal processes and speed up your project delivery.

Good luck and stay safe
Regards
Team Quickscrum