FCPX: Using Stabilization on 360 video

I've got some 360 video footage that I've shot with my Samsung Gear 360 (2017 ed.). I've imported the already-stitched video footage into a new event, created a new project, and dragged the first clip to the timeline. Since this footage was shot with the Gear 360 attached to a drone, I want to apply stabilization.

However, when I scroll through the list of options in the Inspector, Stabilization and Rolling Shutter are nowhere to be found. I've tested with some regular 4K footage (shot using the Mavic Pro). When I create a new 4K project, add the Mavic Pro camera footage to the timeline, then select the clip, the above 2 options are visible.

How am I supposed to go about stabilizing the footage and/or getting these 2 options to display in the Inspector? Is this a bug? Or do I need to investigate a 3rd party plugin for stabilization? (**IS** there even a 3rd party stabilization plugin that works on 360 footage?)