I'm starting to work on integrating the draw.io editor into my project https://github.com/jgraph/drawio/tree/dev/src/main/webapp

and success in adding indicator(sub-shape) to my shapes (rectangle..) now i need to do the same to my connector (arrow) but it doesn't work by changing it style:

rectangle shape with indicator

the style used to add indicator

plz if you have any idea to how i can add a small circle next to the connector, i will be thankful

Note: I used app.diagrams.net only to test feasibility, but I am modifying the code in the github repository mentioned in the top

https://app.diagrams.net/?lightbox=1&highlight=0000ff&edit=_blank&layers=1&nav=1&title=Indicator#Uhttps%3A%2F%2Fdrive.google.com%2Fuc%3Fid%3D0B4zVL0rHadsoMTltamdpTlhqd1E%26export%3Ddownload

https://app.diagrams.net/?lightbox=1&highlight=0000ff&edit=_blank&layers=1&nav=1&title=Edges#Uhttps%3A%2F%2Fdrive.google.com%2Fuc%3Fid%3D0B4zVL0rHadsoNXFoanR6eUhyUG8%26export%3Ddownload

To make thinghs more cleare i want to add a shape in top of edge like this : exemple

Thanks