Custom gizmo: drag handle over to another node

Hi, anyone here experienced with 3d gizmo plugins or working with the editor viewport?

When setting and committing a handle, is there a way to detect if the handle is hovering over another node or its gizmo?
I essentially want to connect my custom nodes by dragging the handle over the other one.

Thanks.

I also asked about it here: https://programming.dev/post/3806068. There's a bit more context about my project.