Woo Product Custom_Key

Hello!

I use 2 variation of add custom fields to woocommerce:

1. I use this code in function.php

// Добавляем текстовое поле с выходом блюда - https://www.proy.info/how-to-add-woocommerce-custom-fields/
add_action( 'woocommerce_product_options_general_product_data', 'woocom_custom_field_product_amount' );
function woocom_custom_field_product_amount() {
  // Create a custom text field
  // Text Field
  woocommerce_wp_text_input(
    array(
      'id' => 'product_amount',
      'label' => __( 'Количество', 'woocommerce' ),
      'placeholder' => '',
      'desc_tip' => 'false',
      // 'description' => __( 'Enter the custom value here.', 'woocommerce' )
    )
  );
}
// Hook to save the data value from the custom fields
add_action( 'woocommerce_process_product_meta', 'woocom_save_custom_field_product_amount' );
/** Hook callback function to save custom fields information */
function woocom_save_custom_field_product_amount( $post_id ) {
  // Save Text Field
  $text_field = $_POST['product_amount'];
  if( ! empty( $text_field ) ) {
     update_post_meta( $post_id, 'product_amount', esc_attr( $text_field ) );
  }
}
// Display Custom Field Value
echo get_post_meta( $post->ID, 'product_amount', true );

2. I use plugin “WooCommerce Custom Fields” (https://codecanyon.net/item/woocommerce-custom-fields/11332742?s_rank=5)

In first case (in Function.php) I made a custom field called ‘product_amount’.
In second case (in plugin “WooCommerce Custom Fields”) I made a custom field called ‘serving_size’

Then in Elementor I choose “Woo Product Custom_Key” and enter custom key. I tried and “product_amount” and “serving_size” (without quotation marks). And any custom fields are not showing

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