private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.visionai.v1.UserSpecifiedAnnotation,
            com.google.cloud.visionai.v1.UserSpecifiedAnnotation.Builder,
            com.google.cloud.visionai.v1.UserSpecifiedAnnotationOrBuilder>
        getUserSpecifiedAnnotationFieldBuilder() {
      if (userSpecifiedAnnotationBuilder_ == null) {
        userSpecifiedAnnotationBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.visionai.v1.UserSpecifiedAnnotation,
                com.google.cloud.visionai.v1.UserSpecifiedAnnotation.Builder,
                com.google.cloud.visionai.v1.UserSpecifiedAnnotationOrBuilder>(
                getUserSpecifiedAnnotation(), getParentForChildren(), isClean());
        userSpecifiedAnnotation_ = null;
      }
      return userSpecifiedAnnotationBuilder_;
    }
<pre>
User provided annotation.
</pre>

<code>.google.cloud.visionai.v1.UserSpecifiedAnnotation user_specified_annotation = 2;</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/Annotation.java