can I add my own data to defualt critical logs messges?

Hello ,
want to know is this possiable or doable
today when someone is trying to connect to the router I get this messag on the log

Jun/20/2021 17:34:34 memory  system,error,critical   login failure for user admin from 8.19.16.6 via winbox

so when this message been send to my syslog ,this is what I get:

From: ('10.0.0.1', 42425) received message: b'<27>Jun 20 17:34:34 2M2S login failure for user admin from  8.19.16.6 via winbox'

is there an way to add my own information \ edit the defulat message
so for example it will send also the uptime of the unit?

Jun/20/2021 17:34:34 memory  system,error,critical   login failure for user admin from 8.19.16.6 via winbox !02:05:33

Thanks ,