Thanks for reaching out to us with your question!
All available map collections provided by Highcharts can be found here: https://code.highcharts.com/mapdata/
. As far as I see, there isn't any map data provided for such regions as described in your post. In order to add these regions into the US map, you'd have to provide data in TopoJSON/GeoJSON format or create your own map. As an answer to your question, Highcharts Maps supports map data in TopoJSON/GeoJSON format, so as long as the format of the data is valid, it should work with your regions. You can read more about how to add your custom map in below articles:
https://www.highcharts.com/docs/maps/cu ... ojson-maps
Let me know if you have any further questions!