Add form to summary product page

Paste code in function.php in Child theme

add_action( 'woocommerce_single_product_summary', 'xso_woocommerce_cf7_single_product', 30 );
  
function xso_woocommerce_cf7_single_product() {
   echo '<button type="submit" id="trigger_cf" class="single_add_to_cart_button button alt">Liên hệ tư vấn</button>';
   echo '<div id="product_inq" style="display:none">';
   echo do_shortcode('[contact-form-7 id="10148" title="Liên hệ tư vấn"]');
   echo '</div>';
   wc_enqueue_js( "
      $('#trigger_cf').on('click', function(){
         if ($(this).text() == 'Liên hệ tư vấn' ) {
         $('#product_inq').css('display','block');
         $('input[name=\"your-subject\"]').val('<?php the_title(); ?>');
         $('#trigger_cf').html('Đóng lại');
         } else {
         $('#product_inq').hide();
         $('#trigger_cf').html('Liên hệ tư vấn');
         }
      });
   " );
}