Learn how to get a product’s Customized Fields in a unique template file?

so I’ve some Superior Customized Fields on my product web page. They’re displayed within the store loop, like so:

add_action('woocommerce_after_shop_loop_item_title', 'tagline', 5);
perform tagline() {
    international $product;
    $product_id = $product->get_id();
   
    if (isset(get_fields()['product_tagline'])) {
        $tagline = get_fields()['product_tagline'];
    }

        echo '<p class="tagline">' . $tagline . '</p>';
 
}

I am additionally utilizing ACF to pick out merchandise in a submit, so if we point out merchandise in a weblog submit, I can choose them to show as a sidebar. I am scuffling with getting the $tagline from my product fields to make use of in my sidebar.

I’ve tried $tagline = get_fields()['product_tagline']; however the result’s null. Any thought of the place I am going fallacious?