Source for "Custom Palette"

I saw that there is a new [https://www.radix-ui.com/colors/custom](https://www.radix-ui.com/colors/custom) page where we can generate a palette based on official radix colors but couldn't find the source for this generator. I would like to programmatically generate this inside my design system and don't want to go the website to generate than copy paste the css (_which I'm also generating programmatically_). So, a `@radix-ui/colors/customPalette` package would be really nice and will make this more useful.