Myth-Auth Role filter parameter issues

Hi,
i am using myth-auth in My application that have both frontend and backend users.

backend user groups:  owner, admin, customer_support
frontend user groups:  customer

i want all the loggedIn backend users to pass through the below filter.

in app/Config/Filters when i use filter parameters like below

Code:

public filters = [
    'role:owner,admin,customer_support' => ['before' => ['admin/*']],
];

am getting  the following error.

role:owner,admin,customer_support filter must have a matching alias defined.

So how can i achieve this?