When I want to use point markers to navigate to, the app is just a huge UX ****. See the process:
Slide up to search -> click "+ New" -> Search address using voice command here because Google on the main screen does not work for non english cities -> Select approx. location you want or just random -> click "More" -> click "show on map" -> place a marker to desired location to navigate to -> click "Routes". And thats it. You have to repeat the same process for adding s custom stop btw. This is terrible UX.