You can use subscription.newsExpression (expression) to set expression for selecting news headlines that will be received from container. For example:

  var s = JET.News.create()
             .newsExpression("BOJP OR ABNNEW")            
             .onAppend(function (upd) { console.log(upd.h); })
             .onInsert(function (upd) { console.log(upd.h); })
             .start();

The above code will receive news headlines from ABN Newswire and Bank of Japan Announcements.

You can find valid expressions from filters in News Monitors application.