Thank you for contacting Syncfusion support.
We regret to let you know that the support for “Setting review status to a PDF Annotation” is not yet implemented and we have logged this as a feature request in our database. We will implement this feature in any of our upcoming releases. The feature implementation would also greatly depends on the factors such as product design, code compatibility and complexity. We request you to visit our website periodically for feature related updates.
The status of this feature can be tracked using following link.