How can I load Textures from a Json file to Unreal Engine?

Hello everyone, I was downloading some models for Blender using the Goo Engine, from there I exported it using an addon, then I exported it in FBX Format so that Unreal Engine could recognize it, when I upload it to the UE it generates the mesh, the skeleton, and 4 spheres of completely white materials, the problem is that when I add color to the spheres, the model not only paints the part that it indicates but also paints other parts, the spheres that I generated were, Head, body, hair and clothes.

When I imported the files into Blender, they came in png format and their respective Json files, for head, body, hair and clothing.

I tried to find a way to import the Json into Unreal Engine but it didn’t work as expected, what do you recommend I try?

The body is exported to the unreal engine, only completely white, the skeleton works without problems, the only drawback would be the materials so that the character has color.