League of Legends Wild Rift - Help with textures

[Sneakyerz]

Hello! I wanted to post this thread on wanted to learn how LoL Wild Rift textures work in the game such as the Highlight models.
I uploaded the textures of Malphite as a example and I know most of what textures are what but there's just 1 texture that I don't know what to do with. It's filename is "h_malphite_g_s" so I assumed it was his specular but it doesn't look like it.


Here's the link to all of Malphite's base textures: https://imgur.com/a/NhbjiTt

[Kauesr]

I don't know either exactly what goes where... but playing with the RGB channels on photoshop seems to me that each one of the 4 channels is an part of the texture.
I assume that de RED channel of the texture is the Metallic parts (because on Janna, MF and Ashe models it fits in perfectly)
GREEN and BLUE channel i don't have any idea, it dosen't fit in any node on blender Principled BSDF.