Native Localization package documentation misunderstanding

From the Localization package documentation here

The default Locale Provider uses the Addressables system to provide the available Locales at run time. The benefit of this is that you can add and remove Locale support to a project after you build it, and you can defer loading to reduce the application startup time.

But I can't find the place it shows it's benefits. I can't find how the user can extend the localization database and add more language supports as the real data I was able to find in the resources.assets binary file. Should I manually modify this binary to add more strings after I build - I don't think so. Then how?