Revit Inside Grasshopper | Window-Area per Room

Hi, I have a problem.
I´d like to calculate the Area of the Windows per Room. Is there by any chance to get those numbers out of Revit into Grasshopper?
Kind regards,
Clemens

EDIT:

image
Also, this is a schedule I have in Revit that already calculates the Window Area and has the Room Number as well.

There has been a bug in this area that has been fixed. See this post: List of rooms where windows are located

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