List of all scripts labels

var txtfrm = app.selection[0];
 txtfrm.insertLabel ("key1", "value1")
     txtfrm.insertLabel ("key2", "value2")
     txtfrm.insertLabel ("key3", "value3")
var getLabels = function(item) {
  var f = File(Folder.desktop+"/"+item.id+".idms" ),
  x, a, o = {}, keys, n;
  if  ( !(item.exportFile instanceof Function) ) return;
  item.exportFile ( ExportFormat.INDESIGN_SNIPPET,  f );
  if ( !f.exists ) return;
  f.open("r");
  x = XML ( f.read() );
  f.close();
  f.remove();
  keys  = x..KeyValuePair;
  n = keys.length();
  if ( !n ) return;
  while ( n-- )  {
  o[String(keys.@Key)] = String(keys.@Value);
  }
  x = null;
  return o;
}
var labels = getLabels ( txtfrm );
alert ( labels? labels.toSource() : "None" );