请告诉我，有可能吗？我创建了一个自定义帖子，但我找不到如何添加页面模板选择功能的信息：

function trav_register_region_post_type() {
    $labels = array(
        \'name\'                => _x( \'Regions\', \'Post Type General Name\', \'trav\' ),
        \'singular_name\'       => _x( \'Region\', \'Post Type Singular Name\', \'trav\' ),
        \'menu_name\'           => __( \'Regions\', \'trav\' ),
        \'all_items\'           => __( \'All Regions\', \'trav\' ),
        \'view_item\'           => __( \'View Region\', \'trav\' ),
        \'add_new_item\'        => __( \'Add New Region\', \'trav\' ),
        \'add_new\'             => __( \'New Region\', \'trav\' ),
        \'edit_item\'           => __( \'Edit Regions\', \'trav\' ),
        \'update_item\'         => __( \'Update Regions\', \'trav\' ),
        \'search_items\'        => __( \'Search Regions\', \'trav\' ),
        \'not_found\'           => __( \'No Regions found\', \'trav\' ),
        \'not_found_in_trash\'  => __( \'No Regions found in Trash\', \'trav\' ),
    );
    $args = array(
        \'label\'               => __( \'region\', \'trav\' ),
        \'labels\'              => $labels,
        \'public\'              => true,
        \'hierarchical\'        => true,
        \'has_archive\'         => true,
        \'show_ui\'             => true,
        \'show_in_menu\'        => true,
        \'show_in_nav_menus\'   => true,
        \'show_in_admin_bar\'   => true,
        \'publicly_queryable\'  => true,
        \'supports\'            => array( \'title\', \'editor\', \'thumbnail\', \'page-attributes\'),
        \'exclude_from_search\' => false,
        \'capability_type\'     => \'page\'
    );
    register_post_type( \'region\', $args );
}