Provide an option to bold the text in the progress bar. For example exposing FontAttributes property.
Currently the option is to use implicit style:
<ContentPage.Resources>
<ResourceDictionary>
<Style TargetType="Label">
<Setter Property="FontAttributes" Value="Italic"/>
</Style>
</ResourceDictionary>
</ContentPage.Resources>
<VerticalStackLayout>
<telerik:RadLinearProgressBar Value="40" ValueDisplayMode="Percent"/>
</VerticalStackLayout>