How to customize the header text of a grid column with different colors?

<sfGrid:SfDataGrid x:Name ="dataGrid"

                         ColumnSizer="Star"

                         AutoGenerateColumns="False"

                         ItemsSource="{Binding OrdersInfo}">

 <sfGrid:SfDataGrid.Columns>

     <sfGrid:GridTextColumn MappingName="OrderID">

       <sfGrid:GridTextColumn.HeaderTemplate>

           <DataTemplate>

             <StackLayout Orientation="Horizontal" HorizontalOptions="Center" VerticalOptions="Center">

                <Label Text="Order" TextColor="Purple" />

                <Label Text="ID" TextColor="Blue" />

             </StackLayout>

           </DataTemplate>

     </sfGrid:GridTextColumn.HeaderTemplate>

    </sfGrid:GridTextColumn>

   <sfGrid:GridTextColumn MappingName="CustomerID"/>

    <sfGrid:GridTextColumn MappingName="Freight"/>

    <sfGrid:GridTextColumn MappingName="Country"/>

  </sfGrid:SfDataGrid.Columns>

</sfGrid:SfDataGrid>