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In Echarts, how to title/label series (pies) in nested pie chart

In Apache Echarts, when using multiple pie charts (e.g. nested pies, or even side-by-side pies), how do we add a title to each pie to signify what the pie represents? While the “title” option can accept an array of titles, there isn’t a good way to position them so that they are above, within or in some other way related to the respective pies they are meant to label. It’s as if there’s a missing concept of a seriesLabel / seriesTitle that sits conceptually between the chart title and the individual item labels.