WooCommerce only gives support if you have any premium plugin purchased. For a doubt like this, they suggest contacting a Codeable developer.
I’m going to look for what modification at the template level should be made.
if ( ! function_exists( 'woocommerce_template_loop_product_title' ) ) {
/**
* Show the product title in the product loop. By default this is an H2.
*/
function woocommerce_template_loop_product_title() {
echo '<h3 class="woocommerce-loop-product__title">' . get_the_title() . '</h3>';
}
}