reusable-blocks-management.php

<?php
/**
 * Reusable Blocks Management
 *
 * @package     Reusable_Block_Management
 * @author      Bernhard Kau
 * @license     GPLv3
 *
 * @wordpress-plugin
 * Plugin Name: Reusable Blocks Management
 * Plugin URI: https://kau-boys.de
 * Description: Adds a submenu item to access the reusable block overview.
 * Version: 0.1
 * Author: Bernhard Kau
 * Author URI: https://kau-boys.de
 * License: GPLv3
 * License URI: http://www.gnu.org/licenses/gpl-3.0.txt
 */

/**
 * Adds a link to the reusable blocks overview
 */
function reusable_blocks_management_add_submenu_page() {
	add_submenu_page(
		'tools.php',
		__( 'Blocks' ),
		__( 'Blocks' ),
		'edit_pages',
		'edit.php?post_type=wp_block'
	);
}
add_action( 'admin_init', 'reusable_blocks_management_add_submenu_page' );