frm_filtered_lookup_options

This example adds more content around the values shown in a lookup field. It changes the options like '2.1', '2.2' to 'Version 2.1 is updated', 'Version 2.2 is updated'.

add_filter( 'frm_filtered_lookup_options', 'change_lookup_options', 10, 2 );
function change_lookup_options( $options, $args ) {
  if ( $args['field']->id == 25 ) { // change 25 to the id of the field in the other form
    foreach ( $options as $k => $option ) {
      $options[ $k ] = 'Version ' . $option . ' is updated';
    }
  }
  return $options;
}