I was looking at the specifications section in the online Owner's Manual and came across the spec for the Compact Spare, which is for "Vehicles with optional spare tire" (p.653). In fact, there is a wheel-well and a bracket to take a screw-down clamp for such a tire under all that Styrofoam in the trunk. But there does not seem to be such an option on offer, at least not yet, despite Alex on Autos having announced it in his video review.