Access method of interface through custom annotation in junit test method

Question

I want to access a method in an interface in my test class method in compile time just by using a custom annotation. I dont want to implement the interface by test class. Below are the examples of interface, custom annotation and Test class.

public interface A {
  default Student prepareRequest() {
        return Student.builder()
                .firstName("FirstNamee")
                .lastName("LastNamee")
                .build();
    }
}

@Target(ElementType.METHOD)
@ExtendWith(MockitoExtension.class)
@Test
public @interface CustomAnnotation {
}

class SampleControllerTest {

@CustomAnnotation
void testAdd() {
    //prepareRequest() should be accessible here
}

}

I learnt about @Aspect, BeanPostProcessing and junit jupiter extensions for annotation processing and these are good concepts for runtime processing but I am not getting how can we access that method at compile time just by using custom annotation. Need some guidance for this.

I tried implementing Junit ParameterResolver extension by a custom extension class by giving test method parameter and injecting them at runtime. That worked for me but I dont want to give parameters to the test method and access the prepareRequest() directly