Not sure if this will help you or not. I have an example here that creates repeater rows based on the response from a ajax request https://github.com/Hube2/acf-dynamic-ajax-select-example/tree/master/dynamic-repeater-on-category. There are also several other examples in the same repo that do ajax requests to dynamically populate other fields. I don’t have any examples the exactly fit what you’re looking for but I think that many of the things you’re looking for are represented.
