A priori it's not possible, I found an answer from someone working for Autodesk invetor who says:
Hi! This type of feature is classified as punch in Inventor. It cannot be unfolded or flattened in Inventor yet. In theory, it is a non-linear deformation (some area stretched and some area contracted). Thanks!
johnson.shiue@autodesk.com
Johnson Shiue (johnson.shiue@autodesk.com) Principal SQA Engineer, Inventor Manufacturing Group Autodesk, Inc.