How to configure syslog to use "Threat Weight" on FortiManager

Our FTM is running 7.2.2 and our FTG's are running 7.2.4. These are relatively new installations, and we're trying to trim the amount of syslog traffic to our SIEM. On the FTM at Device Manager > [FortiGate] > Log & Report > Threat Weight, there are several security settings. I don't see where to apply these to the syslog settings, nor can I find any documentation to do so. The "Log Threat Weight" is enabled. We do not have FortiAnalyzer. Is there a way to configure syslog to send security-related info that can be ingested into our SIEM without having a bunch of extra fluff? Thanks