I'm not intentionally using layers. I can go to Maps and create a route with directions, save it, and then say "Open in My Maps", or while in My Maps I can say "New Map", search a placename, click "Add Directions", and then type all the waypoints I want, and My Maps draws in the route. It seems to add each of the destinations I search as an object/layer, and the route as a layer, automatically.
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