woocommerceloop.php

<?php woocommerce_product_loop_start(); ?>

			<?php foreach ( $related_products as $related_product ) : ?>

					<?php
					$post_object = get_post( $related_product->get_id() );

					setup_postdata( $GLOBALS['post'] =& $post_object ); // phpcs:ignore WordPress.WP.GlobalVariablesOverride.Prohibited, Squiz.PHP.DisallowMultipleAssignments.Found

					wc_get_template_part( 'content', 'product' );
					?>
					<!-- obtain id of the product -->
					<p> <?php echo $related_product->get_id(); ?></p>

			<?php endforeach; ?>

		<?php woocommerce_product_loop_end(); ?>