How to set Font properties like size in DataGrid in WinUI 3

I am trying to show a data in tabular format using DataGrid in WinUI 3, but with Header I am unable to affect the font size or any font effect.

I am trying to change it using

   <controls:DataGrid.Columns>
                        <controls:DataGridTextColumn Header="Name" Tag="Name" >
                            <controls:DataGridTextColumn.ElementStyle>                          
                                <Style TargetType="TextBlock">
                                    <Setter Property="FontSize" Value="5" />
                                </Style>
                            </controls:DataGridTextColumn.ElementStyle>
                        </controls:DataGridTextColumn>

But it just doesnt work. I need to know:

1. Is it the right way to change controls:DataGridTextColumn font size ?
2. The XAML does not recognize controls:DataGridTextColumn & its attributes outside the controls:DataGridTextColumn tag, so for each header I will have to set property manually like this ?

Also FYI, the Nuget Package Manager as show in WINUI3 APP from MS Store for DataGrid implementation is

Microsoft.Toolkit.UWP.UI.Controls.DataGrid

which is so wrong, for WinUI projects its

CommunityToolkit.WinUI.UI.Controls.DataGrid

This should work:

<Page
    x:Class="DataGridTests.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:controls="using:CommunityToolkit.WinUI.UI.Controls"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:local="using:DataGridTests"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:primitives="using:CommunityToolkit.WinUI.UI.Controls.Primitives"
    Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"
    mc:Ignorable="d">

    <controls:DataGrid ItemsSource="{x:Bind ViewModel.Items, Mode=OneWay}">
        <controls:DataGrid.ColumnHeaderStyle>
            <Style TargetType="primitives:DataGridColumnHeader">
                <Setter Property="FontSize" Value="50"/>
            </Style>
        </controls:DataGrid.ColumnHeaderStyle>
        <controls:DataGrid.Columns>
            <controls:DataGridTextColumn
            Header="Name"
            FontSize="50"
            Binding="{Binding Name}">
            </controls:DataGridTextColumn>
        </controls:DataGrid.Columns>
    </controls:DataGrid>

</Page>

Note that DataGrid and DataGridColumnHeader doesn't have the same namespaces.