Patterned shadow from spot light

Hi, I want to have a patterned shadow from spot light. How can I assign texture or pattern to a shadow which is made by spotlight?

I’m not sure if this is what you need, but you can add a cookie to that light. Basically a cookie is just a grayscale image that modifies the projection of the light. You can make this texture however you like the light to be projected.
Check this link: Unity - Manual: Cookies