AppTheme.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
                    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml">
    <Style TargetType="Label" x:Key="SmallLabel">
        <Setter Property="FontSize"  Value="14" />
    </Style>

    <Style TargetType="Label" x:Key="MediumLabel">
        <Setter Property="FontSize"  Value="16" />
    </Style>

    <Style x:Key="MediumBoldLabel" TargetType="Label" BaseResourceKey="MediumLabel" >
        <Setter Property="FontFamily"  Value="OpenSansSemibold" />
        <Setter Property="TextColor"  Value="Black" />
    </Style>

    <Style x:Key="MediumNormalLabel" TargetType="Label" BaseResourceKey="MediumLabel" >
        <Setter Property="FontFamily"  Value="OpenSansRegular" />
        <Setter Property="TextColor"  Value="CornflowerBlue" />
    </Style>

    <Style x:Key="SmallBoldLabel" TargetType="Label" BaseResourceKey="SmallLabel" >
        <Setter Property="FontFamily"  Value="OpenSansSemibold" />
        <Setter Property="TextColor"  Value="Black" />
    </Style>

    <Style x:Key="SmallNormalLabel" TargetType="Label" BaseResourceKey="SmallLabel" >
        <Setter Property="FontFamily"  Value="OpenSansRegular" />
        <Setter Property="TextColor"  Value="CornflowerBlue" />
    </Style>

</ResourceDictionary>