Autodesk Fusion insert

Hi.
I wonder if someone knows how to do a insert Autodesk Fusion.
I have tried to do it with the coil with diameter 20.15 mm and revolutions 0.3 mm and 100 mm in length, but it gets so thin and narrow that it doesn’t work. Trying to do an insert like the picture, but are not able to find how to do it?
It should be 3 inserts and 8mm in width and 3mm depth and goes about 180 degrees turn and be a square.