[Dovecot] dirsize quota in sql pass db?

Is there a way to return a per user dirsize quota from a passdb sql lookup? If so, what is the syntax?

maybe "select quota as userdb_quota"?

..and in mysql table, quota column would be: "quota=dirsize:storage=10240" ?

I'm using mbox, with /etc/passwd userdb, and mysql passdb. Thanks, Ken

-- Ken Anderson Pacific.Net