Any experts know how to apply post processing only to edge?
Something like to how edge detection works with outlines.
Couldn’t find any tutorial for that, any help will be appreciated. 
You could use the material editor line portion of this video to find the edges, except when he plugs everything into the lerp at 40ish minutes, plug what you want to do into the B part instead of just making it black.
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I sell this outline shader, and it comes with help and support to the user if they need help implementing or altering.
In essence as @Detach789 said; depending on the shader you can get the outline mask and apply the normal to only affect the outline mask.
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Yes, it works.
Thank You