[Yaml-core] limitation of anchor and alias?

[Tom C. <bo...@gm...>]

I have an anchor as follows:

helm-install
      docker-flags: &my_docker_flags
        - "--network host"
        - "--env KUBECONFIG=/tmp/admin.conf"
        - "--env HOME=${env.HOME}"
        - "--volume ${env.KUBECONFIG}:/tmp/admin.conf:ro"
        - "--volume ${env.PWD}:${env.PWD}"
        - "--volume ${env.HOME}/.helm:${env.HOME}/.helm"
        - "--volume
${var.docker_config_basepath}:${var.docker_config_basepath}"

later I want to do:

      docker-flags:
        <<: *d my_docker_flags
        - "--env K8_NAMESPACE=${env.K8_NAMESPACE}"

But, the last line is flagged as bad indentation of a mapping entry YAML

Have I come across a limitation?