Add WooCommerce Order ID column to Gravity Forms export

gistfile1.txt

add_filter( 'gform_export_fields', 'add_fields', 10, 1 );
function add_fields( $form ) {
    array_push( $form['fields'], array( 'id' => 'orderid', 'label' => __( 'Order ID', 'gravityforms' ) ) );
    return $form;
}

add_filter( 'gform_export_field_value', 'set_export_values', 10, 4 );
function set_export_values( $value, $form_id, $field_id, $lead ) {
    switch( $field_id ) {
    case 'orderid' :
        $value = 'echo $order->id;';
        break;
    }
    return $value;
}

The first example returns the form id; the second returns a 0.