private com.google.protobuf.MapFieldBuilder<
            java.lang.String,
            com.google.cloud.visionai.v1.AnnotationValueOrBuilder,
            com.google.cloud.visionai.v1.AnnotationValue,
            com.google.cloud.visionai.v1.AnnotationValue.Builder>
        internalGetElements() {
      if (elements_ == null) {
        return new com.google.protobuf.MapFieldBuilder<>(elementsConverter);
      }
      return elements_;
    }
<pre>
Customized struct represnation in annotation.
</pre>

Protobuf type {@code google.cloud.visionai.v1.AnnotationCustomizedStruct}
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/AnnotationCustomizedStruct.java