How to get a ROC curve and AUC from unsupervised algotithm?

My dataset and the process in the file.zip as following.
 In the anomaly detection extension,  I use k-NN Global Anomaly Score operator to get the anomaly score of every instance in the dataset. The Generate ROC operator in the extension can only get the true_positive_rate and false positive rate, however, I can't get the ROC curve and AUC. Can I use some operator to directly get the ROC curve and AUC on the basis of my present process in RapidMiner?