Add another data series to the chart, then label the points for that data series with the batch number. The arrow could probably be added, if you really need the arrow shape, as a custom picture in place of the marker. Add data label to the point with the batch number.
Assuming you currently have 3 columns in your chart's data table, add a fourth column:
The fourth column places the marker for this series, and the fifth column is used to label the points with the batch number.
Is that something you can work with?
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