public @Nullable NullabilityAnnotationInfo findOwnNullabilityInfo(@NotNull PsiModifierListOwner owner) {
    NullabilityAnnotationInfo info = findEffectiveNullabilityInfo(owner);
    if (info == null || info.isContainer() || info.getInheritedFrom() != null) return null;
    return info;
  }
public @Nullable NullabilityAnnotationInfo findOwnNullabilityInfo(@NotNull PsiModifierListOwner owner)