Entry font size Xamarin.Forms iOS

I am using xamarin forms and I want different font sizes for different platforms, for example i want my Android entries to have FontSize 14, and in iOS I want them to be FontSize 12, I can do it programatically with the code below, but is there any way to do it in XAML?

 if (Device.OS == TargetPlatform.iOS)
        {
            Entry.FontSize = 12;

        }