Adding Hoops to View- Hoops List

I like the fact that can view where the hoop will be by selecting Embroidery > Hoops > Hoops list. I like this feature because it helps me, the beginner, to know which size hoop to reach for.

I just bought the 5.5"x5.5" Magna Hoop, but that size is not listed in the square hoops. In fact, the square hoops are all pretty big. So, does anyone know if it's possible to add that hoop to digitizing software and if so, how to do it?

Thanks,