Hey kjustynski-
I have entered a feature request to make the properties of the User Interface section of the widget component accessible with Get/Set functions. You can follow this report here: Unreal Engine Issues and Bug Tracker (UE-45371) . You can track the status of the request as it is reviewed by our development staff. Please be aware that this request may not be implemented, or that it may not be prioritized to occur anytime soon.
Cheers