Hi Emil,
Thanks for your update.
You can achieve named font size support for headers of circular gauge in sample level with the mentioned code.
Sizes are too small for header usage, when setting NamedSize:
We have checked by setting named size in Xamarin Forms Label control and the same size is appeared both Label’s Text and gauge header in all platforms. Therefore, the size is set by Framework, when setting NamedSize property.
If your requirement is to view the header of gauge in larger size, we recommend you to provide hard code value for header’s TextSize.
Regards,
Devi