My 2023 measures a bit over eight feet from the hatch door to the radio. Folding down the seat I can carry an eight foot 2x4 stud laying on the central arm rest. To put something on the dash all the way to the back would require the back seat to be raised and you might get a nine foot object in there but you wouldn't be comfortable doing it for any distance.
BTW, the Leaf back seat does not fold flat with the trunk area like it does in our ICE car.
