How to make sure Report shows data for a given user automatically, not for all of them?

Case: What you see on the screenshot it a sort of contractor space where a contract can see their tasks, report time spent. But there are no filters in reports allowing to limit stats per this contractor only… I can filter manually only. I want chart to show data for Nicholos only automatically.

Like on database level I can easily do like so:

What am I missing?