Hi
That's a great idea!
I am absolutely thrilled with the component!
You also know a lot about leaflet.
I already started to create a map with it.
simon.sommerfugl.de/index.php/verbreitungskarte
For this I additionally use the "leaflet-locationpicker".
simon.sommerfugl.de/index.php/mein-bereich/fundmeldungen
I then enter the decimal degrees in your placemarks.
Later, the 2 decimal degrees of this form should be automatically entered into the database and automatically create a new placemark.
I have KML files and GPX files in the backend as paths. They are displayed as layers above the OSM.
The squares are TK25 quadrants. If you click in a quadrant, then a popup will pop up with the name. The KML / GPX files have these names and numbers in the source code.
I do not know if there is a leaflet script that can read out the number / name from the GPX or KML file if I have an input field in the form where I have the TK25 number (eg 3648), always 4 digits is, and displays a dot directly in the middle of the right quadrant on the map.
many Greetings
F.