Another question: I create a kuberrnetes.yaml.ConfigGroup from the deployment yamls a component I use (argo) publishes. Can I mutate the Kubernetes object definitions the yamls specify?

Yes. In the config options there's a field called transformations

is there an example for it somewhere?

@gray-city-50684 https://github.com/pulumi/pulumi-kubernetes/blob/master/examples/helm/index.ts#L18