Doughnut

The [ObservableObject], [ObservableProperty] and [RelayCommand] attributes come from the CommunityToolkit.Mvvm package, you can read more about it here.

This web site wraps every sample using a UserControl instance, but LiveCharts controls can be used inside any container.

sample image

View model

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

namespace ViewModelsSamples.Pies.Doughnut;

public partial class ViewModel : ObservableObject
{
    // you can convert any array, list or IEnumerable<T> to a pie series collection:
    public IEnumerable<ISeries> Series { get; set; } =
        new[] { 2, 4, 1, 4, 3 }.AsPieSeries((value, series) =>
        {
            series.MaxRadialColumnWidth = 60;
        });
}

XAML

<UserControl
    x:Class="UnoWinUISample.Pies.Doughnut.View"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:lvc="using:LiveChartsCore.SkiaSharpView.WinUI"
    xmlns:vms="using:ViewModelsSamples.Pies.Doughnut"
    mc:Ignorable="d">

    <UserControl.DataContext>
        <vms:ViewModel/>
    </UserControl.DataContext>
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>
        <lvc:PieChart Series="{Binding Series}" ></lvc:PieChart>
    </Grid>
</UserControl>

Articles you might also find useful:

Pie chart control
pie series properties