lynt-managed.php

<?php
/**
 * Plugin Name: Managed plugins
 * Description: Managed plugins detection
 * Author:      Vladimir Smitka
 * Author URI:  https://lynt.cz/
 * License:     GNU General Public License v3 or later
 * License URI: http://www.gnu.org/licenses/gpl-3.0.html
*/

defined('ABSPATH') or die('nothing here');

add_filter( 'all_plugins', 'lynt_plugin_header' );

function lynt_plugin_header( $plugins ) {

  foreach ( $plugins as $key => $value ) {
    if(is_link( WP_PLUGIN_DIR . '/' . explode("/",$key)[0])) {
      $plugins[$key]['Name'] = '[Managed] '.$plugins[$key]['Name'];
    }
  }

  return $plugins;

}