How to change the texture for detecting planes in ARCore 1.2

Hi, I'm trying to use a different texture for the detecting planes, but with the PlaneGrid material, the texture only uses its black/white data.
I want the material to be opaque or at least transparent with the colors from the texure and I tried using the standard material or the diffuseWithLightEstimation but it only shows a solid color.

I know it could be done editing the ARCore PlaneGrid.shader but I have no idea about editing shaders, help me please...

 

Make a copy of the ARCore/PlaneGrid shader and replace the fragment shader

Code (CSharp):

1. fixed4 frag(v2f i) : SV_Target
2. {
3.   fixed4 col = tex2D(_MainTex, i.uv);
4.   return col;
5. }

 

I want to add real time reflection on plane grid shader.How can i do that?
I have used several solutions but wasnt able to find a proper one.Any help would be appreciated.