In our plugin implemented KML layers import. So you can define in your maps settings link to the required KML file and all implemented in this file additional content will be automatically imported to your google map published in your post, page or widget. Using KML files in your maps you can create really advanced additional layers for your map like custom markers, polygons, polylines and much more.
Please check General settings section, there you’ll find field KML file. Just define there link to your KML file. That’s it!