add_filter('wpo_update_cart_cart_item_meta', function ($cart_item_meta, $item) {
  return array_merge($cart_item_meta, array(
    'addons' => isset($item['addons']) ? $item['addons'] : null,
  ));
}, 10, 2);

add_filter('wpo_update_cart_loaded_product', function ($loaded_product, $item) {
  return array_merge($loaded_product, array(
    'addons'         => isset($item['addons']) ? $item['addons'] : null,
    'readonly_price'       => $item['line_subtotal'] / $item['quantity'],
    'readonly_custom_meta_fields_html'   => isset($item['addons']) ? wc_get_formatted_cart_item_data($item) : '',
  ));
}, 10, 2);

add_filter('wpo_product_calc_line_subtotal', function ($calc, $item) {
  return isset($item['addons']) && $item['addons'] ? false : $calc;
}, 10, 2);

add_filter('wpo_get_item_by_product', function ($product, $cart_item_data) {
  return array_merge($product, array(
    'addons'      => isset($cart_item_data['addons']) ? $cart_item_data['addons'] : null,
    'readonly_price'    => $cart_item_data['line_subtotal'] / $cart_item_data['quantity'],
  ));
}, 10, 2);

add_filter('wpo_cart_item_is_price_readonly', function ($is_readonly, $cart_item_data) {
  return isset($cart_item_data['addons']) && $cart_item_data['addons'] ? true : $is_readonly;
}, 10, 2);