I’m not sure whether this will help, but you can “share” the osm.org page with a marker.
Go to osm.orm click the sixth icon from the top: “Share”
In the popup panel, check “Include marker”, a blue pin appears that you can move around. After positioning it, you can copy the link in the popup dialog.
The marker when sharing in OSM only points to a location, while I need to highlight a whole segment of a street so the reader clearly sees where it starts/ends
Umap isn’t bad, but it doesn’t draw a route by clicking a start/end and drawing a route by following the street: I must draw carefully so it actually follows the road
OSM > Map Data: Indeed, I need to show only part of a street, so I don’t have to spend time explaining where the part I mean starts/ends.