Can`t access to gradient colors in shape.

Hi.

Trying to access to gradient colors using expression.

I thought that I can access to them using array, something like this:

thisComp.layer("Cubes").content("Group 1").content("Rectangle 1").content("Gradient Stroke 1").colors[0]

But it work only for colors[0], rest of them (color[1]. color[2]) doesn`t work at all.

Maybe there is another option how to access them?

Thanks.