The current ClusterInput template for Tail plugin doesn't support additional parameters. I'm proposing the following change:
In charts/fluent-operator/templates/fluentbit-clusterinput-tail.yaml, add:
{{- with .Values.fluentbit.input.tail.extraParams }}
{{- toYaml . | nindent 4 }}
{{- end }}
{{- with .Values.fluentbit.input.tail.extraParams }}{{- toYaml . | nindent 4 }}{{- end }}