How to add options to a Select with JQuery (Ninja Forms)

Question

jQuery(document).on('nfFormReady', function() {
    
  var textField = jQuery( '#nf-field-3918' );
  var selectField = jQuery( '#nf-field-3962' );

  textField.val( 'New Value' ).trigger( 'change' );

});

in this code, I can manipulate a text field like so: textField.val( 'New Value' ).trigger( 'change' );

but How can I add more options to a select element?

I tried this:

var inputValue = textField.val();
  var newOption = jQuery( '<option>', {
      value: inputValue,
      text: inputValue
    } );

  selectField.append( newOption );
  selectField.trigger( 'change' );

but didnt work