public com.google.cloud.visionai.v1.UserSpecifiedAnnotation.Builder
        getUserSpecifiedAnnotationBuilder() {
      bitField0_ |= 0x00000002;
      onChanged();
      return getUserSpecifiedAnnotationFieldBuilder().getBuilder();
    }
<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