Ondrag Event Requested!

I am labeling data on the chart by using the onclick event and the arguments inside it. It's awesome for single point labeling; but when I need to do a massive labelling job, I need to specify an offset range inside that and map to the original data set to get all the information I need.

I wonder if it is feasible to add an ondrag event to allow user to handle event over a range of data points. Its arguments will be an array of the onclick arguments.

Thank you for all the hardwork
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