Slab with spread footing

Curretnly Chief generates a slab with its proper conditions showing the footing on the inside perimeter of the slab, which is pretty much standard, but what if conditions ask for the footing to spread both sides of the slab.

I was tempted to put a stem wall then build slab in between, and this will probably show what I'm looking for.

This will also create a double count of materials for the footings since the program would see two footings being built.

How do you make a regular slab that shows the footing on the outside perimeter of the slab as well as the inside?

At the moment I created a polyline with breaks to represent the outer footing in dashed lines, this will suffice, but, can we do it so this extra step is taken out?

Thanks