Showing the sum of product attributes in woocommerce

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Javascript

PHP

WordPress

I have Custom Product boxes installed, it shows product price and attributes when visitors adds a product to the gift box, I'm trying to sum the product attributes right below the total price, but it will not show anything.

What I have tried:

here is the code I've tried

$dynamicPrice = get_post_meta($product->get_id(), '_per_product_pricing_active', true);
$dynamicFett = get_post_meta( 'attribute_fett' );
$dynamicKolhydrater = get_post_meta( 'attribute_kolhydrater' );
$dynamicProtein = get_post_meta( 'attribute_protein' );
$dynamicKcal = get_post_meta( 'attribute_kcal' );