NPM Syslog Viewer configuration or formatting

Does anyone know if there is a way to configure how syslogs are received in NPM?

I am doing log forwarding from my SIEM, but it will not take the syslog from the SIEM.

The SIEM is sending <PRIORITY> TIMESTAMP HOSTNAME MESSAGE, but NPM just puts the HOSTNAME as part of the message, it does not accept it as the HOSTNAME or IP address as fields.

How can I correct that?

RFC-3164 states that this is how messages should be forwarded.

Thanks for any insight.

Jason