mrm_be/Configuration/Backend/AjaxRoutes.php

<?php

return [
  'mrm_be_dkz_branch' => [
      'path' => '/dkz/branch',
      'target' => \Meramo\mrm_be\Controller\DKZController::class . '::getBranchAction',
  ],
  'mrm_be_dkz_lists' => [
      'path' => '/dkz/lists',
      'target' => \Meramo\mrm_be\Controller\DKZController::class . '::getListsAction',
  ],
  'mrm_be_dkz_search' => [
      'path' => '/dkz/search',
      'target' => \Meramo\mrm_be\Controller\DKZController::class . '::getSearchedAction',
  ],
];