dovecot - Nov 2016 - doveadm service: verify client cert

Hello,

I want to open a socket for connecting doveadm using tcps. I do the
following:

    service doveadm {
        inet_listener {
            port = 5001
            ssl = yes
        }
    }

At the same time, I would like to verify client certificates for
connections goes to port 5001.
I am trying to do the following, but it doesn't work:

    protocol doveadm {
        ssl_require_crl = yes
        ssl_verify_client_cert = yes
    }

How could I achieve required behavior?