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As the figure shows, i want to add text both above and below the QCandlestickSet, I don't know what to do.
I could not see the text and its content in the picture you shared. However, the PointLabelsFormat property for QLineSeries appearing in your post might be what you're looking for.
I didn't make it clear.. I want to add text on the QCandlestickSeries, not QLineSeries. thanks for your reply!