On the 22FB, There is enough room between the door and the back of the dining bench to add a pantry closet. We added a closet maid 3 shelf storage shelf. They also are stackable, so you could add another on top. The shelf can be ordered with doors which would be handy for a pantry (we use ours for shoes, so didn't need doors.) If you order the "alder" color, it is almost a perfect match for the color of the factory installed cabinets. We got ours from Home Depot.
We anchored the lower unit with a bolt tieing it to the bench , which was hidden underneath in the storage portion of the seat. You can then anchor the upper unit to your just installed lower unit, or you can anchor it to the wall with mollybolts.
Link to closet maid cabinet
Here are two units side by side, but you would stack them one on top of the other.