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[Request] Allow customdata attribute to be accessed by hovertemplate using sankey, #4243

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@mtwichan

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@mtwichan

I am/was giving a workshop to an enterprise customer where they want the ability/flexibility to be able to pass in multiple sets of external metadata to customdata, that can be than used by hovertemplate for the sankey graph.

We tried using customdata from the top level data property, but were not able to access it. Currently hovertemplate can only access whatever is within it's scope, e.g node or link. And, it can only take in one data set (list data structure). This could be helpful for other graph types as well.

CC: @alb-erandelcastillo

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