Question Multiple Vector3 to same shader

Hello, I have a C# script attached to a sphere that set the sphere position (Vector3) in a shader property that calculate the distance between the plan where the shader is used and the sphere + a radius and change the plan texture in that area.
That works fine when I have only one sphere, but how can I do if i want to apply the effect to multiple spheres at the same time? I'm using URP.
Basically I want to apply the texture only on a certain area of the mesh.
I've made a scheme, maybe it helps to understand:



I want to achieve this result:

But in multiple parts of the environment at the same time.