I would caution against displaying this many metrics in one chart, but if you want to do it, have at it! :)

<UserControl.Resources>
        <local:TestData x:Key="data" />
        <DataTemplate x:Name="pieChartMarker">
            <Grid>
            <igChart:XamPieChart
                ItemsSource="{Binding Item.Breakdown}"
                LabelMemberPath="Label"
                ValueMemberPath="Value"
                LabelsPosition="BestFit">
            </igChart:XamPieChart>
            </Grid>
        </DataTemplate>
    </UserControl.Resources>

    <Grid x:Name="LayoutRoot" Background="White">
        <Grid.ColumnDefinitions>
            <ColumnDefinition />
            <ColumnDefinition Width="Auto" />
        </Grid.ColumnDefinitions>
        <igChart:XamDataChart>
            <igChart:XamDataChart.Axes>
                <igChart:NumericXAxis x:Name="xAxis" MinimumValue="0" MaximumValue="15" />
                <igChart:NumericYAxis x:Name="yAxis" MinimumValue="0" MaximumValue="15" />
            </igChart:XamDataChart.Axes>
            
            <igChart:XamDataChart.Series>
                <igChart:BubbleSeries
                    XAxis="{Binding ElementName=xAxis}"
                    YAxis="{Binding ElementName=yAxis}"
                    ItemsSource="{StaticResource data}"
                    XMemberPath="X"
                    YMemberPath="Y"
                    RadiusMemberPath="Total"
                    MarkerTemplate="{StaticResource pieChartMarker}"
                    LabelMemberPath="Label"
                    >
                    <igChart:BubbleSeries.RadiusScale>
                        <igChart:SizeScale 
                            MinimumValue="70"
                            MaximumValue="100">
                        </igChart:SizeScale>
                    </igChart:BubbleSeries.RadiusScale>
                </igChart:BubbleSeries>
            </igChart:XamDataChart.Series>
        </igChart:XamDataChart>
        
    </Grid>

And code behind:

public partial class MainPage : UserControl
    {
        public MainPage()
        {
            InitializeComponent();

            //DataContext = new TestData();
        }
    }

    public class TestData
        : ObservableCollection<TestDataItem>
    {
        public TestData()
        {
            Add(new TestDataItem()
            {
                Label = "North America",
                Total = 10,
                X = 6,
                Y = 3,
                Breakdown = new Breakdown() {  
                    new BreakDownItem() { Label = "Hats", Value = 3 },
                    new BreakDownItem() { Label = "Shoes", Value = 5 },
                    new BreakDownItem() { Label = "Bags", Value = 2 }
                }
            });
            
            Add(new TestDataItem()
            {
                Label = "South America",
                Total = 3,
                X = 9,
                Y = 4,
                Breakdown = new Breakdown() {  
                    new BreakDownItem() { Label = "Hats", Value = 1 },
                    new BreakDownItem() { Label = "Shoes", Value = 1 },
                    new BreakDownItem() { Label = "Bags", Value = 1 }
                }
            });

            Add(new TestDataItem()
            {
                Label = "Europe",
                Total = 7,
                X = 3,
                Y = 8,
                Breakdown = new Breakdown() {  
                    new BreakDownItem() { Label = "Hats", Value = 3 },
                    new BreakDownItem() { Label = "Shoes", Value = 1 },
                    new BreakDownItem() { Label = "Bags", Value = 3 }
                }
            });

            Add(new TestDataItem()
            {
                Label = "Australia",
                Total = 15,
                X = 6,
                Y = 7,
                Breakdown = new Breakdown() {  
                    new BreakDownItem() { Label = "Hats", Value = 2 },
                    new BreakDownItem() { Label = "Shoes", Value = 7 },
                    new BreakDownItem() { Label = "Bags", Value = 6 }
                }
            });

            Add(new TestDataItem()
            {
                Label = "Africa",
                Total = 2,
                X = 10,
                Y = 11,
                Breakdown = new Breakdown() {  
                    new BreakDownItem() { Label = "Hats", Value = 1 },
                    new BreakDownItem() { Label = "Shoes", Value = 1 },
                    new BreakDownItem() { Label = "Bags", Value = 0 }
                }
            });
        }
    }

    public class TestDataItem
    {
        public string Label { get; set; }
        public double Total { get; set; }
        public double X { get; set; }
        public double Y { get; set; }
        public Breakdown Breakdown { get; set; }
    }

    public class Breakdown
        : ObservableCollection<BreakDownItem>
    {

    }

    public class BreakDownItem
    {
        public string Label { get; set; }
        public double Value { get; set; }
    }