Hatch open, closed, where on the hatch: side , middle, where on the seat, Rear Seat up stright or reclined? At the floor level or up higher? With so many variables it might be best, for you, to go to a nearby dealer to get the dimension you really need.
I notice you list your homepage and occupation as, edmunds.com, if you work there maybe someone has that info already on a interior specification sheet supplied my the manufacturer.
I'll make the measurement and inform, however as the hatch is very inclined it may not tell you what you need to know. Some folks have taken their stroller by the dealer and tried it out. One person did not buy as a result.