Visual Studio Team Services (VSTS) and PowerBI

I'm working on proof of concept report/dashboard that focus on integrating TFS and PowerBI. I have made the connections and basic report works fine. 

Howerver, majority current TFS online reporting is based on parameters such as @CurrentIteration (sprint). I cannot find anything like that in VIsual Studio Dataset that specifies what current sprint is.

Please could you advise what I can do about it.