GeometryGym Revit Plugin or IFC Plugin

Hi guys, I need some help for the export of my model. I created a grasshopper bridge with parametric steel beams and concrete soil, but when I tried to export it in ifc to open it in revit, I can't select a custom profile beam like the one I provided (lower flange thickness bigger than upper flange thickness). How can I do without loosing my parametric options on the cross section beam parameters? I've tried several ways and options but without success.  

Thank you so much.

Leonardo