How to add processors for eks?

I have installed ES, Kibana 8.9.1 on EKS 1.27 and struggling with fleet.

I would like to add "processors" definition to my Fleet for EKS as described here.

  • add_fields:
    target: orchestrator.cluster
    name: clusterName
    url: clusterURL

Wherever I add the entry above I get following error:

Reconciliation error: "fleet-server" is invalid: spec.config: Invalid value: v1.Config{Data:map[string]interface {}{"processors":[]interface {}{map[string]interface {}{"add_fields":map[string]interface {}{"fields":map[string]interface {}{"name"

fleet-server or elastic-agent installation manifest, how/where can I add the definition above?

Thanks and Regards