Woocommerce - show product variations without product parent

WC_variable_products.php

/* i need help to modify this snippet to show only the product variations without the product parent */

add_action( 'pre_get_posts', 'custom_remove_products_from_shop_page' );
function custom_remove_products_from_shop_page( $q ) {
    if ( ! $q->is_main_query() ) return;
    if ( ! $q->is_post_type_archive() ) return;
    if ( ! is_admin() && is_shop() ) {
    $q->set( 'post__in', array(0) ); }
remove_action( 'pre_get_posts', 'custom_remove_products_from_shop_page' );