Woocommerce | 如果page_id = .. {}

I am trying to apply specific functions to a certain page ID in Woocommerce. However, it does not seem to apply. I have looked at both Wordpress and Woommerce conditional tags (https://docs.woocommerce.com/document/conditional-tags/).

The simple code I am testing is shown below, but even that is not working.

if ( is_product()) {
    echo ' HALLO sdfdsfsdfsdfsdf ';
}

I have also tried with page_id and post_id but cannot get this to work. I have added this code to my functions.php in my child theme.

Does anybody know to to write a specific function only for a specific product page (I know the value).

Method - 1

is_page() relies on a complete global $wp_query object. If you call it before the action template_redirect has been fired, it might be impossible to get that data.

add_filter( 'template_include', function( $template ) {
    if ( is_product() )
        echo 'HELLO';

    return $template;
});

Method - 2

The WordPress/WooCommerce conditional tags won’t work until after the wp action is fired, making it the earliest point at which you can use the tags. You can view the entire list, and the order of the core WordPress actions at the Action Reference page.

add_action( 'wp', 'init' );
function init() {    
  if ( is_shop() ) {    
    echo 'HELLO, this works!';
  }    
}