Hi,
If you still look for this function or if anyone is seeking this function, you can refer to this Shopping Cart Price Rule per Store View for Magento 2 extension by BSS Commerce.
It helps administrators set up shopping cart price rules for store views instead of the whole website as Magento default.
You can also offer specific promotions to their local customers to persuade them to buy more and increase sales.
Hope this is useful! If it helps, please give me a Kudo or Accept as Solution!
James Hoang