What elements can Blender export to Unity for animations?

Okay, you may be confused by the title but I'll explain:
Importing a Blender animation into Unity is very easy, just rig your model, then animate it and export to unity
(or even animate the model, just export and use a tool like UMotion)

But i like to go beyond, there are other "animation techniques" that Blender can export to Unity, these are blendshape (used in character customization), morphing, shapekeys and so on (But they look the same). I want to find more elements that Unity can use from Blender.

Like Blender can export LOD and Unity automatically recognizes, what other Blender elements can I export to Unity for animation?

The only ones I discovered through experimentation were blendshapes and similar stuff.
To avoid having to write a giant list, is there anything in the Blender or Unity documentation about it? I searched but i can't find, I'm not sure which keywords to use when searching too, so I came for help.

Thanks in advance,
- Emanuel Messias, R.d.S.

 

A quick update guys (and another example of what i'm talking about):
recently i discovered that if i apply constraints to bones of my 3D model, Unity will natively recognize.

Apparently, in fact there are other elements that Blender can export to Unity (and Unity can natively recognize), not only in terms of animation, but in general.