Architecture for white-brand Project

Hello !:wave:

I am working on a multi-brand project build around one-white brand.
It’s an ipad application with a unique flow. All screens have a fixed structure but some properties of components will change depending on the brand identity (like : typography + color + corner radius for buttons or typography + color for Title, etc)
Design an easily reproductible reference frame used in each brands is essential in this context.

- How do I organize my Figma project ? Is setting up a library suitable for this type of project? And variants?

- How to proceed to facilitate the creation of a new brand? Project template ?

Thanks a lot !