thank you for your suggestion.
We know about this update and we're already planning this update. Unfortunately, this new language means a lot of work to implement a completely new parser/exporter.
Another problem is Gedmo support. We will be not able to support partial export in annotations and partial export in Attributes. So we need to wait also for Gedmo and update the complete export for Gedmo extensions.
We already started some works on parser engine prototype but I can't promise you the exact term of delivery.