OSM 3d tileset JSON file

Sorry for the noob question,

I am using Cesium, and I would like to make a 3d city representation.

I would like to retrieve a .json of the current location I am from OpenStreetMap. I have the position and the altitude of where I am.

The problem is that I do not understand/can’t find from which url source I can retrieve buildings ID and their relative height for a defined tileset position in openstreetmap

I found a lot of exemple on internet and lib that do this, but I don’t exactly understand how to do this from scratch. like i navigate to x,y coordinate, and I want to get the data from the building around those coordinates.