public Builder setAnnotation(com.google.protobuf.Struct value) {
        if (annotationBuilder_ == null) {
          if (value == null) {
            throw new NullPointerException();
          }
          annotation_ = value;
        } else {
          annotationBuilder_.setMessage(value);
        }
        bitField0_ |= 0x00000002;
        onChanged();
        return this;
      }
<pre>
The struct format of the actual annotation.
</pre>

<code>.google.protobuf.Struct annotation = 2;</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/AppPlatformCloudFunctionRequest.java