yq v4: How to inline edit a specific document in a file containing several documents

[ghost]

Hello,
using yq version 4, how can I edit a specific document of an YAML file which contains several documents? With previous versions I could use the -d argument in combination with -i to edit the file inline while only touching the document at the given index.

This is the shortened input file:

apiVersion: kops.k8s.io/v1alpha2
kind: Cluster
spec:
  kubernetesVersion: x.xx.xx
---
apiVersion: kops.k8s.io/v1alpha2
kind: InstanceGroup
spec:
  role: Bastion
---
apiVersion: kops.k8s.io/v1alpha2
kind: InstanceGroup
spec:
  role: Master
---
apiVersion: kops.k8s.io/v1alpha2
kind: InstanceGroup
spec:
  role: Node

After modifying the file using yq it should look like below (only two lines have been added in the very end):

apiVersion: kops.k8s.io/v1alpha2
kind: Cluster
spec:
  kubernetesVersion: x.xx.xx
---
apiVersion: kops.k8s.io/v1alpha2
kind: InstanceGroup
spec:
  role: Bastion
---
apiVersion: kops.k8s.io/v1alpha2
kind: InstanceGroup
spec:
  role: Master
---
apiVersion: kops.k8s.io/v1alpha2
kind: InstanceGroup
spec:
  role: Node
  externalLoadBalancers:
    targetGroupArn: xyz

With yq version 3, I was using the command below to reach the expected result:
yq w -i -d3 input.yml "spec.externalLoadBalancers[+].targetGroupArn" "xyz"

I would prefer to identify the document that should be modified rather by a specific property (i.e. '.spec.role == "Node"') than by using the documentIndex. However, since I haven't found a proper solution yet, I would also go with the documentIndex if it was leading to the expected result.

[mikefarah]

yq e -i 'select(.spec.role == "Node").externalLoadBalancers.targetGroupArn = "xyz"' sample.yaml

[ghost]

Thanks a lot! Got it now :-)

Just for the sake of completeness: referring to my example it has to be:
yq e -i 'select(.spec.role == "Node").spec.externalLoadBalancers.targetGroupArn = "xyz"' sample.yaml.