What matters
The last turn, the access road and the entrance decide the arrival
You can add a place to Waze in the app or in the Waze Map Editor. Where an area is locked, you suggest an edit and a local map editor reviews it.
Waze also says place details updated on Google Maps generally show up in Waze search and place details. So your Google profile and the Waze map both matter.
Drive the last stretch yourself, or ask a regular, and look at where the route ends.