Organically, as you cannot do this in maps. However, you need to ask yourself why you would want to do this. It’s really not best for the searcher. If I am looking for “Newcastle Plumber,” would I really want to see a list of “Plumbers in Canberra City”? Google will always be fighting you on this and trying to ensure you don’t rank. So, you could open a new location to rank in maps, or use paid ads.