Preview URL should be able to take in a value, like an object mapping locales to the URL format

For instance, say one were to use the URL format of mysite.com/usa/en, this would mean that the site is localized to follow the format of /{country}/{language}. This means that for each page or section model, you have to duplicate your code of this object mapping to the locales, like it this case, it would be { 'en-US': 'usa/en' }. Would be nice if this could be passed in through code somehow, so Builder always understands this to be the URL format, while keeping it DRY.