How to export single artboard from multiple artboard as jpeg using extendscript

main();

function main() {
  if (!app.documents.length) return;
  var doc = app.activeDocument;
  var abIdx = 1; // Artboard index
  exportJPG(doc.path, abIdx);
}

function exportJPG(path, idx) {
  var options = new ExportForScreensOptionsJPEG();
  options.antiAliasing = AntiAliasingMethod.ARTOPTIMIZED;
  options.compressionMethod = JPEGCompressionMethodType.BASELINESTANDARD;
  options.embedICCProfile = false;
  options.scaleType = ExportForScreensScaleType.SCALEBYFACTOR;
  options.scaleTypeValue = 1;
  var itemToExport = new ExportForScreensItemToExport();
  itemToExport.artboards = idx + ''; // Convert number to string
  itemToExport.document = false;
  app.activeDocument.exportForScreens(path, ExportForScreensType.SE_JPEG100, options, itemToExport);
};