Custom Shader with automatically set outputs possible? (Unity Plugin)

Hey folks,

Apologies if this has been asked before, having a hard time finding details.

On Unity, a Substance default material will automatically assign its outputs using the Standard Unity shader. (Albedo, Normal, etc, all the standard outputs). Is it possible to use a custom shader here and replicate that behaviour? What are the shader properties Substance internally looks for?

To be specific, we're looking to use a custom a shader on the actual Substance material, much like the Standard Shader used by default, we're not looking to create a new material with a custom shader and add outputs manually. Is this possible at all or this hardcoded to only work witht he Unity Standard shader? 

Thanks!