How to conditionally expose data in Spring Data REST projection?

There is a projection UserProjection and the User table has field - enable_email, a boolean.

@Projection(name = "summary", types = User.class)
public interface UserSummaryProjection {

    String getEmail();
}

Visiting URL /app/users/{id}?projection=summary shows the email as expected

1. How can the summary projection be configured to return the email only if enable_email is true?

2. Also will that configuration only affect this projection or be applicable across all projections for the User entity?

In projection, it was only a matter of annotating with @Value with Spring bean and method name as below:

@Value("#{@userUtil.manageEmail(target)}")
String getEmail();

Then, I created a Spring Bean annotated with the @Component annotation and added the method below:

public String manageEmail(User user) {
    Profile profile = profileRepo.findByUser(user);
    String[] paramsEnabled = profile.getSettings().split(",");
    boolean emailAllowed = Arrays.stream(paramsEnabled).anyMatch((s) -> (s.equals(Constants.EMAIL_ENABLED)));

    return  emailAllowed ? user.getEmail() : null;
}