Can we create edge flange on a sheet metal geometry createdfrom loft feature from sheet metal toolbar?

I want to create a dome for a storage tank. Dome is to be preparedfrom sheet of thickness 6mm. Top & bottom edges of this domeare having bends. I am getting able to create a flange or thelofted sheet metal geometry but not both the things in anysequence.

I need to create this part because my basic need is to get thedevelopement length of this part from software since manuallycalculated developement length is incorrect.

SolidworksSheet Metal