A histogram bar is a count, and a count is a thing that has already thrown away the rows it counted. Except here it has not: the series was handed the raw delivery times and the chart did the binning itself, so it can still name the observations behind every bar. Press the button and each bar comes apart into exactly the deliveries it was standing for, every dot leaving from the slice of the bar that was counting it.
chart.rowSeries(), which returns
one cluster per bar holding that bar's own observations. No data is passed
back in: a histogram is one of the few marks that can name its rows, because
it was given them in the first place. Requires
apexcharts/features/stats for the rows and
apexcharts/features/morph for the transition, both of which the
full bundle already includes.