knockoutjs – How to update label for select “region_id” field on the Checkout page?

On the Checkout page, I need to update the label of the “region_id” field like this:
If the Country selected is Indonesia, the label of the “region_id” field is “City”.
The remainder is still “State / Province”.
(Only applicable to countries with regions)
enter image description here
After select Indonesia:
enter image description here

Thanks for reading!