It would be great if it was supported to have certificates injected into existing ConfigMaps if they are labelled, similar to the approach that ist available in OpenShift https://docs.openshift.com/container-platform/4.11/networking/configuring-a-custom-pki.html#certificate-injection-using-operators_configuring-a-custom-pki

Something like the snippet belo would inject the bundle to configmaps with the provided label.

target:
  configMapLabel:
    trust.https://cert-manager.io/inject-bundle: "true"