How to move a outer element to GoJs Diagram Canvas?

There is an operation that needs to be done that involves dragging a component from JsTree to the GoJS.

We tried to use Robot.js but this envolves only GoJs Diagram Elements. How we can do that?

Thanks in advance.

Sample Image:

Have you seen HTML Drag and Drop, and external Clipboard pasting or HTML Drag and Drop ?

I guess jsTree is a jQuery UI component, so the latter is probably more appropriate.