[syslog-ng] Spoofing syslog message in syslog-ng

Hi, Is there any way to append some text to syslog message in syslog-ng.conf and forward to NMS system. I would like to append a pre-defined text for every syslog message coming to syslog-ng and forward to NMS. Could you tell me the possible ways of doing it. Thanks, Ravi Kumar P.