Web application architecture for different countries?

Question

Ruby on Rails

I'm working on the app, Rails backing, React front. I want to roll out in different countries gradually. Bek will be common, only instances of the front will multiply. But what is the best way to make a front so that the core is common, but what kind of chips for a particular country were different? On rails, I did something similar through engines.
Transferred translations to i18n, some specific variables in .env. But this is not enough. I will give an example:
Country Kazakhstan. A new item appears in the menu list, which leads to a separate page with some kind of feature. This will not happen in other countries.

Answer 1

Alternatively, separate entry points with different App files. Well, or download optional parts in separate chunks on demand.