Set memcached server by occ

Hello, i’m trying to configure memcached_servers parameter by occ, but i cant find any correct syntax for this command. I use command sudo -u www-data php /var/www/nextcloud/nextcloud_$SITENAME/occ config:system:set memcached_servers --value=localhost,11211 and i’m get result
'memcached_servers' => array ( 'array' => 'localhost,11211', ),
but not
array( array('localhost', 11211), ).
How can i set memcached_servers parameter using occ utility correctly.