dovecot stats-writer socket permissions

I have seen this thread about being able to run doveadm as a non-root user, but I don't understand the solution even though I have seen other pages give this link as the solution.

http://bit.ly/2MC5oq9

What configuration is necessary so that I can set the permissions on /var/run/dovecot/stats-writer socket-file so when dovecot starts my virtual mail account has read/write access?

I saw another page about adding

service stats { }

Although I set user, group, and permissions, it did not seem to have any effect on the permissions when I restarted dovecot.

Thank You.