I would like to be able to configure a tooltip to be shown if the user hovers over an x-axis category. I would also like it to be dynamic based on the category. My use case is each x axis category represents a flight, to keep the label succinct I use the flight number, however it would be good if the user could find out more information about the flight such as the date, departure, destination etc. Currently I put this information in the tooltip for the data series, but when I show multiple data series this text looks out of place and also makes it harder to see the data relating to the data series point.