There is no built-in Charts Drag-and-drop functionality that allows for dragging series items, neither a non-trivial custom implementation that I can suggest comes to mind, but if you have the time, please submit a feature request to our Feedback portal, describing the desired functionality in further details:
This will help us estimate the customer demand for such an enhancement, and consider providing it in a future version of the Charts package, based on the interest. Thank you in advance.
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