Hi, I think we cannot do it. we must configure it by CLI command way:
FG80CM3914600011 # config log syslogd setting
FG80CM3914600011 (setting) # set
status Enable/disable remote syslog logging.
*server Address of remote syslog server.
reliable Enable/disable reliable logging (RFC3195).
port Server listen port.
csv Enable/disable CSV formatting of logs.
facility Remote syslog facility.
source-ip Source IP address of syslog.