posible to have custom data

Here is how I added my own list (in my case it was a list of languages).

Either in file functions.php of your theme, or in another PHP file you’ll include in functions.php, add your own PHP class which implements Listo :

class Listo_Languages implements Listo {

    private static $items = array(
        'af' => "Afrikaans",
        'ar' => "Arabic",
        'bg' => "Bulgarian",
    );

    private static $groups = array();
    private function __construct() {}

    public static function items() {
        return self::$items;
    }

    public static function groups() {
        return self::$groups;
    }

}

List your items in $items variable like I did (I deliberately shortened the list for the example), using pattern key => value.

Then hook your new list to available lists in Listo.

function add_my_own_listo_list( $list_types ) {
    $list_types['languages'] = 'Listo_Languages';

    return $list_types;
}
add_filter( 'listo_list_types', 'add_my_own_listo_list' );

And you’re done ! Hopefully it helps.