Update Address for Guest

I am building an App for Guest customers to purchase products.

By default, when I am creating and adding items to a Cart (co-cart), a default Country and State (or province) is determined (I am not sure how it is determined).

Is there a way for me to update the Shipping and Billing address of the Cart for a Guest customer (so no login or authentication), so that shipping fees and taxes get updated?

I’ve tried to use different endpoints /session, /cart/update, etc. but I didn’t found any relevant documentation.

Thanks!