Phong material conversion: using reflection prop as metallic

[Alexander Kuznetsov]

I'm currently working on models with dielectric materials (skin in particular) and trying to get around these materials becoming metallic after conversion.
I've noticed that metallic factor is hardcoded in FBX2glTF for phong material, but Blender for example uses reflectionFactor prop instead:

https://developer.blender.org/diffusion/BA/browse/master/io_scene_fbx/import_fbx.py;136030c95656db371add0c5b7878f6442b8f24eb$1425

Would it make sense to do the same here?