unit – How to use the colors of a nuance in a script?

In the editor of Unity, I have defined a sample with some colors used throughout our game:

The color picker, with a color sample added

This grade is saved in a file in the project's Assets folder:

 ProjectFolder  Assets  Editor  Main Colors.colors

I'd like to use the colors of this shade somewhere in a script:

GetComponent() .color = SomethingHere.MainRed;

What is the best way to proceed? Or is it not possible?