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using roughness/gloss maps with PhongE or Phong shaders in Maya

First time poster, but I've lurked for a while and found many helpful tips here.  Now for the Maya question.

I've just started doing some game modding, but due to limitations with the mod tool, only FBX models are accepted.  Unfortunately, I can't get any PBR stuff to export (or appear in game) so it looks like the only shaders (so far) the mod tool accepts are basic ones like Blinn, Lambert, Phong and PhongE (I'm new to all of this but as I understand it, most engines need some sort of interface to translate the 3D editor stuff to the game engine).  I've found places for the specular map, normal and diffuse map in the Phong shaders but how can I apply the roughness/gloss map?  Based on research, it looks like the roughness map goes into the cosine node on a Phong shader and the "highlight" node on the PhongE?  Do I need to place any node between those two?  Thanks for any help and I apologize for the lack of clarity (still learning all this).



[a more general question: can basic shaders like PhongE be made to accept more complex PBR maps?]


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