Custom fields not exporting

Hi,

I want to export a custom field I made for WooCommerce Products, but it is not appearing in a feed in the list under “Value”.

I made the field with the following code:

add_action( 'woocommerce_product_options_inventory_product_data', 'woo_add_custom_inventory_fields' );

function woo_add_custom_inventory_fields() {

  global $woocommerce, $post;
  
  echo '<div class="options_group">';
  
  woocommerce_wp_text_input( 
	array( 
		'id'          => '_ean_code', 
		'label'       => __( 'EAN Code', 'woocommerce' ), 
		'placeholder' => 'BRK7010BE',
		'desc_tip'    => 'true',
		'description' => __( 'Vul de EAN code voor dit product in. Vul "*" in als hij leeg moet zijn.', 'woocommerce' ) 
		)
	);
	
  
  echo '</div>';
	
}

add_action( 'woocommerce_process_product_meta', 'woo_add_custom_general_fields_save' );

function woo_add_custom_general_fields_save( $post_id ){
	// Text Field
	$woocommerce_text_field = $_POST['_ean_code'];
	if( !empty( $woocommerce_text_field ) )
		update_post_meta( $post_id, '_ean_code', esc_attr( $woocommerce_text_field ) );
		
}

Do you know how to fix this?

Best Regards,

Joren