Sheet metal inner corners relief

Hi,

I'm starting to familiarize myself with sheet metal as I've never worked with it before. I was wondering if there is a way to get the following feature: (note this was not done using sheet metal, as it does not allow it)

The current method I tried (using sheet metal) is to have a base flange and add a rectangular cut and then try to bend in the centerline of the rectangular cut, however it doesnt let me proceed.

I can't find any other options, the corner relief options dont help either. Does anyone know how to do this or some alternative to get an inner corner that will have some square sitting against it?

SolidworksParts And Features