How do I change the colors of Quick Controls 2 default style?

[ivarec]

From the docs, it's clear how to do that for the Material and Universal styles. There are properties like Material.Accent and Material.Background to help with that.

How do I do that for the Default style? I thought it would be as easy as creating a custom palette and applying it to my application window, but I couldn't find any reference to something like this in the docs.