Can a nav mesh be set along any axis, not just surfaces that face in +Z?

Hi all,

Bit of an odd question maybe, I am wondering if it is possible to build a nave mesh that will calculate along all sides of a large object, not just along the world up vector as seems to be the standard behavior. So A character that could walk on wall, or for my purposes, along all sides of a sphere. I have a small AI character on a large sphere, always trying to reach a certain point on that sphere, which is determined by a VR motion controller casting a linetrace that intersects with the sphere when the trigger is pulled. Any pointers would be greatly appreciated. Thanks!