Import Navmesh or generate navmesh data based on my navmesh mesh file

Omniverse Isaac Sim
1

Isaac Sim Version
5.1.0
Operating System
Ubuntu 22.04
GPU Information
• Model: NVIDIA GeForce RTX 3090
• Driver Version: 580.65.06
Topic Description
I have a *.navmesh file, I want to use it in Isaac sim 5.1, is there any way to import this mesh file as navmesh in isaac sim or generate navmesh(Isaac sim can use) by this navmesh file?

I try to export this .navmesh file as .obj(called external navmesh) and import in isaac sim as a mesh, add navmesh stage in isaac sim, ensure the navmesh encapsulate the external navmesh, and then press bake, but I don’t see any blue navmesh in the viewer.

Thanks for help!