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Pull information from Case and display on page

I need to pull information from Case i.e. current case say for example

<Request.CreatorUserId> = Me.Case.Creator.Id;

now I want to show this on web form in one of the tab, the issue is bizagi enforce me to add data Source. In other senario I have added WFUser in master entity so have access to record hence I showed on page where in this case I cannot add WFCase table in Master entity model so I am kind of stuck here, unless there are other ways to achieve this which I am unaware of that.