[question] how to add a newline in to 3-4th level of yaml

[dinhdobathi1992]

src :

kind: DaemonSet
apiVersion: apps/v1
metadata:
  name: calico-node
  namespace: kube-system
  labels:
    k8s-app: calico-node
spec:
  selector:
    matchLabels:
      k8s-app: calico-node

dest: (expected)

kind: DaemonSet
apiVersion: apps/v1
metadata:
  name: calico-node
  namespace: kube-system
  labels:
    k8s-app: calico-node
spec:
  selector:
    matchLabels:
      k8s-app: calico-node
      test: true

[dinhdobathi1992]

I can do it by

yq '(.spec.selector | .matchLabels) += {"test": "true"}' abc.yaml