Customise the connection points on a shape : draw.io is
https://desk.draw.io/support/solutions/articles/16000042498-how-to-add-remove-connection-points-how-to-connect-anywhere-on-a-shape-
Select the shape, then click Edit Style in the Style tab of the format panel. Alternatively, press Ctrl+E (on Windows) or Cmd+E on macOS. Enter the new connection points in the form of an array of x,y coordinates to the shape style definition. For example, to add only two points, one to the left and one to the right: points= [ [0,0.5], [1,0.5]];
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