Additional logs in log viewer

Would it be possible to add the two logs reverseproxy.log (WAF) and letsencrypt.log (LE) mentioned in point 4 at the bottom of this page to the log viewer? Thank you.
XGS firewall log

I need to view the firewall log for a longer period of time, but the log file viewer only shows a few days of firewall logs. I cannot find the firewall log in /var/tslog in the advanced shell. Please...