How to extend existing material color palette

Question

There are plenty of examples online of how to add additional color palettes for material. However, I cannot find anything for what I wish to do. For our theme, our neutral (grey) colors go from 900 to 0, rather than material's 50.

In short, i wish to modify palette.grey to include an additional property: '0' so that I can use grey.0 in material components.

I've tried doing the following:

  interface PaletteColorOptions {
    '0': string;
  }
  interface Color {
    '0': string;
  }
  interface PaletteColor {
    '0': string;
  }

But none of these seem to work. Is this even possible?