Adding the country flag to emojis

Apple is not in charge of defining emoji. Unless the the Republic of Karakalpakstan gains complete independence from Uzbekistan and the UN recognizes it as a new country, the people who are in charge of defining emoji won't consider creating an emoji for it.

See: The Unicode Consortium (March 22, 2022) – The Past and Future of Flag Emoji

"there is one particular type of emoji for which the Unicode Consortium will no longer accept proposals. Flag emoji of any category."

If the UN recognizes a country, and that country is allocated an ISO 3166-1 alpha 2 code point, a flag emoji for that code point is "automatically recommended" with no need for any proposal. But if you want a flag for a region that doesn't already have one – or for anything else that isn't a country? Then where the Unicode Consortium is concerned, you can go jump in a lake.

As an alternative to sending emoji, you could send small photos or "stickers" in messages. These will require a lot more cellular data to send, but many people these days have plans that allow sending large amounts of data.

Make stickers from your photos on iPhone - Apple Support

Due to the very large number of subnational entities with ISO-3166-2 codes and limited unit capacity, only a handful of them actually have emojis. If still desired, click here and choose a form.

Except as noted above, the Unicode Consortium, not Apple, decides what becomes an emoji, and they're no longer accepting requests for new flag ones.

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Apple does not determined emoji, the unicode consortium does. They are no longer considering flag emoji. Unicode.org