UXP Script dataMerge

Hello everybody,

I am beginner with UXP Script for Indesign. I have a problem with function Data Merge. I don't know how change settings for ONE RECORD from list

In ExtendScript this is OK: doc.dataMergeProperties.dataMergePreferences.recordSelection = RecordSelection.ONE_RECORD;

but in uxp not function.

Can you help my please?
Thank you for answer.