how do i update cluster config via helm charts? i'm trying to enable v2 multi stage query engine and below mechanism in the values.yaml isn't working.

cluster:
  name: my-pinot-cluster
  extra:
    configs: |-
      pinot.multistage.engine.enabled=true
      pinot.server.instance.currentDataTableVersion=4
      pinot.query.server.port=8421
      pinot.query.runner.port=8442

is it not possible to add them via helm chart? if possible, i would prefer to not depend on apis, and have them in the code.

cluster configs can be updated during runtime and taken effect immediately. That’s why using API to manage them. If you want, you can add a new k8s Job to run and update the cluster config.