Adding custom field for Haproxy filebeat module?

Hello, I am using filebeat to ship my haproxy logs to the elastic cloud.
But the thing I am missing in exported fields is "frontend_port" , referred to as %fp in haproxy custom log format.

Is there a relatively easy way to add that field to be shipped?
Thank you.

This looks like a duplicate :slight_smile:

It is ) the other thread got very mixed up, so i thought I would create a different one for this issue specifically. Feel free to remove it, as it's resolved. Thank you @steffens

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