Surface Fillet / Edge Blend (Single Surface)

Hey Folks

I have surface. I would like to make a fillet on (1) the outer corner of the surface and (2) an inner corner.

I can achieve (2) through the use of the Circular Blend command. Any idea how I can achieve the same on an internal corner? The sheet would have to be extended then cut. Hopefully there is a one-stop tool to do this. See attached picture for my example.

Thanks