knative configures some images in config maps, e.g. [here](https://github.com/knative/serving/blob/a8b532db1ceaf1b479e35c4413d6d5b6dc9da27c/config/core/configmaps/deployment.yaml#L26). For comparison, kbld added some support for config maps such as [this one](https://github.com/cloudfoundry/cf-for-k8s/blob/edd5c11449790aadffeff9a2bcd6f61f20371d55/config/_ytt_lib/github.com/cloudfoundry/cf-k8s-networking/config/istio-generated/xxx-generated-istio.yaml#L6512) which stores serialised JSON in a config map.