How to migrate realurl configuration for TYPO3 v9?

Question

I want to migrate a realUrlconf to my TYPO3 v9.

Before, in a realurl_conf, my config was :

$GLOBALS['TYPO3_CONF_VARS']['EXTCONF']['realurl']['_DEFAULT']['postVarSets'] = array (
'_DEFAULT' => array (

  // fe_users
  'my_user' => array (
    array (
      'GETvar' => 'fe_users[uid]',
      'lookUpTable' => array (
        'table'       => 'fe_users',
        'id_field'      => 'uid',
        'alias_field'   => 'concat(first_name, "-", name)',
        'addWhereClause'  => ' AND NOT deleted',
        'languageGetVar'  => 'L',
        'languageField'   => 'sys_language_uid',
        'autoUpdate'    => 1,
        'expireDays'    => 1,
        'useUniqueCache'  => 1,
        'useUniqueCache_conf' => array (
          'strtolower'    => 1,
          'spaceCharacter'  => '_',
        ),
      ),
    ),
  ),
)

Now, in a fe_user table, i have a field named slug

In my site config, I have written:

  routeEnhancers:
  PagesUser:
    type: Simple
    limitToPages:
      - 136
    routePath: '/my_user/{userid}'
    _arguments:
      userid: fe_users[uid]
    aspects:
      userid:
        type: PersistedAliasMapper
        tableName: fe_users
        routeFieldName: slug

Here, the page 136 is annuaire.

I try to transform /annuaire/page-perso-1?fe_users%5Buid%5D=201 like /annuaire/my_user/name_forname

I think the problem is in the way of coding _argument to get fe_users[uid].

I have tried with fe_users[uid] or fe_users|uid or fe_users/uid.