To je ale nedostatok tych navigacii.
https://wiki.openstreetmap.org/wiki/Guidelines_for_pedestrian_navigation#Routing_on_areas

Skor tu bude problem, ze je to multipolygon (mozno zbytocne), lebo ked je to obycajna plocha, tak minimalne po jej okraji navigovat vedia:
https://www.openstreetmap.org/directions?engine=fossgis_osrm_foot&route=48.1115%2C17.1070%3B48.1130%2C17.1071#map=18/48.11242/17.10865