Fluent-bit.conf to send Winevtlog to Graylog server using GELF output

[GitCardi]

I'm trying to setup Fluent-Bit 3.2.9 on our Windows Server for sending the Windows Event Logs to our Graylog Sever (UDP Input listening on port 3514) using the Fluent-Bit GELF output.
If you can share with me a working configuration file, it will be wonderful. Thanks in advance to the community for your help.

[GitCardi]

My graylog server is now receiving the Windows Security Logs in GELF format, but I'm not able to receive events from the "Microsoft-Windows-Sysmon/Operational"

Here is my Fluent-Bit Configiration file:

[SERVICE]
flush 1
daemon Off
log_level debug

[INPUT]
Name winevtlog
Channels Security,Microsoft-Windows-Sysmon/Operational
Interval_Sec 1
Use_ANSI True
DB winevtlog.sqlite

[OUTPUT]
Name gelf
Match *
Host 10.10.10.10
Port 3514
Mode udp
gelf_short_message_key Message

Thanks in advance for your help.