I've added a function NoesisRegisterStructToStringConverter<T>() and a non templated NoesisRegisterUStructStringConversion(UScriptStruct, Noesis::String()(void*)). They are used to provide a fuction to convert USTRUCT to text. The templated version can be used with USTRUCTs that have a ToString function that returns a FString. The second allows the conversion function to be customized. They are used in NoesisStructWrapper::ToString, which is called by the default converter.

Hello,
I have tested and it actually works well but unfortunately it only covers for ToString but not for equality it seem which would be required to use FGameplaytag for triggers:
For example after using NoesisRegisterStructToStringConverter<FGameplayTag>(); the following trigger doesn't trigger with HealthState being a FGameplayTag :

<b:DataTrigger Binding="{Binding Path=HealthState}" Value="Health.State.Critical">
...
</b:DataTrigger>