How to I create an outwards bend on my sheet metal cone?

Hello, I'm relatively new to solidworks and I can't get my head around this problem. How do I create an outwards, circular, flange-like bend, on the top of my sheet metal cone? I would like the radius of the bend to be 21.5mm. I've attached the .sldprt file and a screenshot of the bend I'm trying to reproduce. I'm thinking there could be a different approach to this, rather than building the cone that way, so I'm open to suggestions. Thank you!

SolidworksSheet Metal