Add reusable Gutenberg blocks into WordPress admin menu

add-resuable-blocks-in-admin-menu.php

<?php
/**
 * Add reusable Gutenberg blocks into WordPress admin menu
 */
function barrd_add_reusable_blocks_admin_menu() {
	add_menu_page(
		'Reusable Blocks',
		'Reusable Blocks',
		'edit_posts',
		'edit.php?post_type=wp_block',
		'',
		'dashicons-editor-table',
		59.1 // Just before `Appearance`.
	);
}
add_action( 'admin_menu', 'barrd_add_reusable_blocks_admin_menu' );