public com.google.protobuf.Struct getAnnotation() {
        if (annotationBuilder_ == null) {
          return annotation_ == null
              ? com.google.protobuf.Struct.getDefaultInstance()
              : annotation_;
        } else {
          return annotationBuilder_.getMessage();
        }
      }
<pre>
The struct format of the actual annotation.
</pre>

<code>.google.protobuf.Struct annotation = 1;</code>

@return The annotation.
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/AppPlatformCloudFunctionResponse.java