Is it possible to edit fluentd.conf to create a custom format for application logs in OpenShift?

Issue

• Openshift-logging collects application logs and forwards them to a security information and event management (SIEM) application that expects a custom header format.
• Can the fluentd.conf be edited in the ConfigMap to add record_transformer lines that insert the desired headers into the forwarded logs?
• Will fluentd.conf edits persist or will the operator/audit function replace the edits with the factory defaults?
• Does openshift allow to edit fluentd.conf to add extra information?