public Builder mergeAnnotation(com.google.protobuf.Struct value) {
        if (annotationBuilder_ == null) {
          if (((bitField0_ & 0x00000002) != 0)
              && annotation_ != null
              && annotation_ != com.google.protobuf.Struct.getDefaultInstance()) {
            getAnnotationBuilder().mergeFrom(value);
          } else {
            annotation_ = value;
          }
        } else {
          annotationBuilder_.mergeFrom(value);
        }
        if (annotation_ != null) {
          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