How to Pass a Field to PowerApp

Hello,

I'm trying to interact with a PowerApp.

Integrating a PowerApp in the report works fine.

But in the demo of the Keynote in seattle I saw a PowerApp reacting on changes in PowerBI.

I know that in the visual you can specify what Fields are passed.

But, on the PowerApp side, how do we refer that ?

I suppose that instead of BrowseGallery1.Selected something like this should be coded

Item = Filter('[dbo].[Task]';T_Id = taskid)

But so far no success ....