How Can I update node of one yaml file from content of another yaml file?

[allwritesri]

I have two yaml files:

key: value
configmap:
	data:
		foo: bar

app: test
config:
	testKey: testValue

I want to update file1.yaml's configmap.data with file2.yaml's config and save it back in file1.yaml so file1.yaml becomes:

key: value
configmap:
	data:
		testKey: testValue

How can I do this?

[mikefarah]

You can do it like this:

yq -i '.configmap.data = (load("data2.yaml") | .config )' data1.yaml