Detect RetentionPolicy.CLASS annotation in JUnit

It is likely there is not a solution, but I hope I am wrong.

I am writing a JUnit5 test to test some model classes. Some fields of the model classes are annotated by Lombok @NonNull which has CLASS level RetentionPolicy.

I want to make sure the Java model classes always comply with some constraints described by a schema. The schema defines which fields are required and which are not. In JUnit test, I want to make sure all fields that are required are annotated by Lombok @NonNull.

However, since the annotation is not a RUNTIME annotation, I do not have access to it in unit test.

Are there any workaround that can achieve my goal to automatically verify the constraint?