Outside Labels

This web site builds the control from code behind but you could also grab it from the toolbox, this sample also uses a ViewModel to populate the properties of the control(s) in this sample.

sample image

View model

using System.Collections.Generic;
using LiveChartsCore;
using CommunityToolkit.Mvvm.ComponentModel;
using LiveChartsCore.SkiaSharpView.Painting;
using SkiaSharp;
using LiveChartsCore.SkiaSharpView.Extensions;

namespace ViewModelsSamples.Pies.OutLabels;

public partial class ViewModel : ObservableObject
{
    private static int _index = 0;
    private static string[] _names = new[] { "Maria", "Susan", "Charles", "Fiona", "George" };

    public IEnumerable<ISeries> Series { get; set; } =
         new[] { 8, 6, 5, 3, 3 }.AsPieSeries((value, series) =>
         {
             series.Name = _names[_index++ % _names.Length];
             series.DataLabelsPosition = LiveChartsCore.Measure.PolarLabelsPosition.Outer; // mark
             series.DataLabelsSize = 15;
             series.DataLabelsPaint = new SolidColorPaint(new SKColor(30, 30, 30));
             series.DataLabelsFormatter =
                point =>
                    $"This slide takes {point.Coordinate.PrimaryValue} " +
                    $"out of {point.StackedValue!.Total} parts";
             series.ToolTipLabelFormatter = point => $"{point.StackedValue!.Share:P2}";
         });
}

Form code behind

using System.Windows.Forms;
using LiveChartsCore.SkiaSharpView.WinForms;
using ViewModelsSamples.Pies.OutLabels;

namespace WinFormsSample.Pies.OutLabels;

public partial class View : UserControl
{
    private readonly PieChart pieChart;

    public View()
    {
        InitializeComponent();
        Size = new System.Drawing.Size(50, 50);

        var viewModel = new ViewModel();

        pieChart = new PieChart
        {
            Series = viewModel.Series,
            IsClockwise = false,
            InitialRotation = -90,

            // out of livecharts properties...
            Location = new System.Drawing.Point(0, 0),
            Size = new System.Drawing.Size(50, 50),
            Anchor = AnchorStyles.Left | AnchorStyles.Right | AnchorStyles.Top | AnchorStyles.Bottom
        };

        Controls.Add(pieChart);
    }
}

Articles you might also find useful:

Pie chart control
pie series properties