How to pass values to a struct declared inside shader in a program in vispy?

Question

My fragment shader contains the following struct variable.

struct Material
{
    vec3 ambient;
    vec3 diffuse;
    vec3 specular;
    float shininess;
};

uniform Material material;
// another uniform
uniform float tmp;

In vispy on using

self.program['material.ambient'] = [1,1,1]
self.program['material.diffuse'] = [1,0.7,1]
self.program['material.specular'] = [0.5,1,1]
self.program['material.shininess'] = 32
self.program['tmp'] = 10

I am getting following errors

WARNING: Value provided for 'material.diffuse', but this variable was not found in the shader program.
WARNING: Value provided for 'material.ambient', but this variable was not found in the shader program.
WARNING: Value provided for 'material.specular', but this variable was not found in the shader program.
WARNING: Value provided for 'material.shininess', but this variable was not found in the shader program.
INFO: Program has unset variables: { 'material.specular', 'material.shininess', 'material.diffuse', 'material.ambient'}

I am using the correct shader program and have linked the right fragment shader. I think vispy dont supports struct types yet, is there any work around by which I can pass these values ?