get material base color input value (not dynamic)

Hi, guys. I have a pak loaded at runtime. It’s have a mesh, some materials, some textures. The mesh have multiple materials: some of them with textures on “base color” input, some with just colors on the same input.
I was able to get the textures using


MyMat->GetUsedTextures(OutTextures, EMaterialQualityLevel::Num, true, ERHIFeatureLevel::Num, true);

but I cant figure out how to get the base color input to get color (constant 3 vector).
I’ve already tried something like


MyMat->GetBaseMaterial()->GetExpressionInputForProperty(MP_BaseColor);

but with no luck.
Any help is appreciated.
Thanks,
JJacques