Question When exporting fbx with auto smooth, where is that info saved?

So I make a model in Blender, choose render smooth and under auto smooth I define an angle to make sure that certain edges stay sharp. I export it as an fbx, import into Unity, and magic happens because that smoothing and the edges stay exactly as in Blender, even if I change the material with a different shader.

But where in the model is that info saved, where could I be able to modifiy it in Unity? I've exported the same model as shaded flat and in Unity can't see any difference at all.


Thanks!