Which version of SolidWorks are you using? I'm not sure when they began to allow edge bends to go around a curve.
Anyhow, the convert to sheet metal feature will not translate that curved edge flange. However, if you convert the flat face to sheet metal (tick the 'keep body' checkbox so you have the original body for reference.
You may then be able to add an edge flange
Id that all over lays the original body nicely, you can 'delete body' the original.
Thank you Bjorn