Hello, no, you cannot use lat/lon to request tiles.

The z/x/y arguments follow the slippy map tiling scheme to display a map.

Normally you would use a framwork like e.g. LeafletJS, OpenLayers, MapLibre or a derivative of those like flutter_map to request tiles and display a map by requesting the right tiles.

If you do need to access single tiles and only have lat and lon, you would first have to define the zoom level you want (from 0 = world to 19 = few houses) and then calculate the x and y values, here you will find some examples for those calculations:

https://wiki.openstreetmap.org/wiki/Slippy_map_tilenames

And to explain this further: frameworks like LeafletJS or MapLibre etc. would need an input by lat/lon to display a map. Those frameworks do the calculations to display a map on a website based on lat/lon by requesting the right tiles for an area defined by your lat/lon input. So based on what you want to achieve (e.g. show a map at location lat/lon in a website?) you should use a framework like e.g. Leaflet to get the result you want.