show tax rates on single product page

add_action( 'woocommerce_before_add_to_cart_form', 'exbtw_melding', 20 );

function exbtw_melding(){
        global $product;
//        $tax_rates = $product->get_tax_class();
        $tax_rates = WC_Tax::get_rates( $product->get_tax_class() );
//        $tax_rates = $product->get_rates(get_tax_rates());
        echo 'Alle vermelde prijzen zijn excl. <b>'. $tax_rates . ' BTW</b> / Tous les prix indiqués sont hors <b> '. $tax_rates . ' TVA</b>';
}