Resolved Mask an gameobject with Image component with a Particle component

Hello. Hope this is the best place to ask this question. I am trying to achieve a result but without success. So here is the case. I have visually, the following layer layout:

Background Layer 1 - Dark color (most behind)
Background Layer 2 - Bright color (middle layer)
Particle Layer - random 2d squares moving from bottom to top (most top layer)

The situation I am trying to create is:

- The Background Layer 1 - Dark color will be always visible
- When the squares from the Particle Layer start to go from Bottom to top will will reveal the Background Layer 2 inside of the squares (like a mask effect or maybe a Chroma Key?)

Is that possible to do in Unity? I am pretty lost here any help would be great.

Thanks.