Can you bake rounded edges to a normal map?

[HandcraftedMedia]

I'm trying to use Octane to bake out rounded edges.
But currently the only passes that show the rounded edges are the shading normal and texture tangent pass, which both are not useful for baking out a normal pass.
The tangent normal does not seem to include the rounded edges. Is this a limitation, or a bug? If it's a current limitation it would be awesome if this could be added!