Are you having any issues after you have attempted to setup the config for your environment?
If you are looking for ways to configure your NXLog agent, the User Guide has many examples on syslog as input and output. Please see the following sections. If you do not find what you are looking for, a search of the document may show what you are looking for.

https://nxlog.co/documentation/nxlog-user-guide#xm_syslog

https://nxlog.co/documentation/nxlog-user-guide#snare