Remove description full size product-category-banners

Hello!
I tried to remove the categry-description from the fullsize-category-banners. (SEO and layout reasons – display via display:none css wouldn´t solve my problem)

I´ve located this
$output .='<div class=”container”>’;
$output .='<main class=”template-page content av-content-full alpha units”>’;
if($description) $output .= “<h1>”.$description.”</h1>”;
$output .='</main></div></div></div>’;
in /config-woocommerce/config.php and … config356.php
unfortunately I cannot override these core-files in my childtheme (right, i can´t?)

Is there any other way to remove this description/h1? As I mentioned – css won´t solve the seo-problem