这是您想要的吗?

add_filter('woocommerce_countries','custom_country', 10, 1);

function custom_country($mycountry){
    $mycountry = array(
        'AF' => __( 'Afghanistan', 'woocommerce' ),
        'IN' => __( 'India', 'woocommerce' )
    );
    return $mycountry;
}