display bundles that the currently viewed product is included in

wc_pb_display_bundles.php

<?php
 
add_action('woocommerce_after_add_to_cart_form', 'wc_pb_display_bundles');

function wc_pb_display_bundles(){
	global $product;
        $product_id = $product->get_id();
	$bundle_ids = wc_pb_get_bundled_product_map( $product_id, false );
	if (!empty( $bundle_ids)){
		$bundle_ids_list = implode( ",", $bundle_ids );
		echo "Also found in these Bundles:\n";
		echo do_shortcode('[products ids="'.$bundle_ids_list.'"]');
	}
}