dovecot - Mar 2018 - How to format auth-worker logs ?

Hello list,

Here's how auth-worker logs : 

Mar 26 10:56:38 auth-worker(1753): Info: sql(someuser at
mydomain.tld,202.107.34.250): Password mismatch

I would like to add the service used, like this :

Mar 26 10:56:38 auth-worker(1753): Info: service=smtp sql(someuser at
mydomain.tld,202.107.34.250): Password mismatch

Any hints on how to acheive this ? 

Yassine.