Hi, I've an areachart with multiple columns and have set focusTarget:category so the tooltips show the values for all of the columns at that X value. However, I'd like to add an extra bit of text to the tooltip without replacing the display of the value. Is this possible? It looks like setting a tooltip column replaces the value display, and I can't see a way to add a columm that appears in the tooltips but isn't represented on the chart.
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