Add this to functions.php

display_p2p.php

<?php //Don't Copy This Line

//Add to single product page.
add_action( 'woocommerce_single_product_summary', 'return_policy', 999 );
function return_policy() {
    // Find connected pages
	$connected = new WP_Query( array(
	  'connected_type' => 'posts_to_pages', // Use same name as you used in the previous function.
	  'connected_items' => get_queried_object(),
	  'nopaging' => true,
	) );

// Display connected pages
// This is just a standard WordPress loop
if ( $connected->have_posts() ) :
?>
<div class="product_meta">
<h2>List of whatever posts</h2>
<?php while ( $connected->have_posts() ) : $connected->the_post(); ?>
    <span><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></span>,
<?php endwhile; ?>

</div>
<?php 
// Prevent weirdness
wp_reset_postdata();

endif;
}

p2p_setup.php

<?php
// Don't copy the php tag above.
function prefix_unique_connection_types_name() {
    p2p_register_connection_type( array(
        'name' => 'posts_to_pages', //Give it a name that you can reference
        'from' => 'post', // This can be the slug name of your CPT as well
        'to' => 'page' // This can be the slug name of your CPT as well
    ) );
}
add_action( 'p2p_init', 'prefix_unique_connection_types_name' );