Resize ANavMeshBoundsVolume at runtime

Can anyone point me toward some documentation on resizing an ANavMeshBoundsVolume object at runtime? I’ve created a modular random level builder for my game and I need to wrap my spawned room modules inside the nav mesh bounds- but I’m not having much luck. I plan to perform this resize only once during the level loading phase, so I’m assuming that it won’t significantly impact performance.

Alternately, would it be smarter (more efficient) to use the editor to drop in a satisfactorily large nav mesh bounds object, then code my random level builder to simply stay within those predefined bounds?