For many reasons, it would be very useful to be able to set a gridline value. I imagine the value and the font and the color would need to be setable. So an easy use case of this would be a scatter-chart to show a scale of grades on an exam over time, in the background of the chart one would want to show a line at 59 representing Failing, another bold gridline at 69 representing below average, and so on and so forth.
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