Automatically generate NavMeshLinks on box colliders. Requires https://github.com/Unity-Technologies/NavMeshComponents to work.
Download and add the files to your project.
Attach the NavLinkGenerator script to a gameobject.
Make any box colliders you want to have links generated on a child of the NavLinkGenerator gameobject.
Make sure a NavMesh has been baked.
Click Create Links On Child Box Colliders in the NavLinkGenerator component.
An example has been set up in the demo scene.