I attached a sample demo project which demonstrates you how you can format the LegendItem for Pie Series. If this is not what you want to achieve or if this does not replicate your setup, I would kindly ask you to send me a more detailed explanation what kind of series types (Bar, Line, Area, Scatter, Stock, Pie, Donut, Polar, Radar) you use.
Hope this will help you. Let me know if you have any other questions.
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