How to echo a PHP code into WooCommerce variation product?

I solved the issue, what i was missing is to convert the API return to string, here is the code hopefully it helps someone.

<?php

add_filter( 'woocommerce_available_variation', 'custom_load_variation_settings_products_fields' );
function custom_load_variation_settings_products_fields( $variations ) {    
    // duplicate the line for each field
    $variations['wccaf_de_asin_var'] = get_post_meta( $variations[ 'variation_id' ], 'wccaf_de_asin_var', true );   
    $variations['wccaf_uk_asin_var'] = get_post_meta( $variations[ 'variation_id' ], 'wccaf_uk_asin_var', true );  
    $amazon = new AmazonAPI("GOOGLE-21", "JIJIOJEFIOJEIOFEJFIO", "DJWIJDIWOJDFIJIOFJDIOWJQFOIJIOIOJWID");
    $item = $amazon->item_lookup($variations['wccaf_de_asin_var'])->get_item_data(); 
    $variations['amz_price_var_de'] = (string) $item->price;    
    return $variations;
}

    //wccf_after_variation_description is a hook i created into variation.php
    add_action( 'wccf_after_variation_description', 'wcff_variation_affiliate_button', 10);
    function wcff_variation_affiliate_button() {

        // IP Geolocation   
        $country_code = $_SERVER ["HTTP_CF_IPCOUNTRY"];
        $de_asin = '{{{ data.variation.wccaf_de_asin_var }}}';
        $uk_asin = '{{{ data.variation.wccaf_uk_asin_var }}}';

        if ($country_code=="DE") {  
        $asin = $de_asin;   
        }

        if ($country_code=="GB") {  
        $asin = $uk_asin;
        }
        echo $asin;


        ?>
<div class="buy_amz_btn_wrap" >     
{{{data.variation.amz_price_var_de}}}
</div>
<?php

    }   
    ?>