Custom Master List based on region

Is it possible to add a custom master list based on a region? for example, specify Africa and it only populates the country list with countries in Africa.

If it is not possible, would you like to add this in the future?

Start by clarifying the intended region definitions and how a custom master list should affect the country picker. Review the existing country-selection and list-population entry points, then identify how the feature could be tested; done means selecting a region consistently limits the available countries.

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