Embedded structs missing JSON tags

We found this in OpenShift back in https://github.com/openshift/machine-config-operator/pull/955 while running Kubebuilder generators, and hit this again recently, so opening an issue to refer to

Several types are missing JSON tags in their embedded fields, for example:
https://github.com/coreos/ignition/blob/master/config/v3_0/types/schema.go#L24-L27
Which throw errors like encountered struct field "" without JSON tag in type "Directory"

In the discussion of the above linked PR, it seems that the reason for this is wanting to keep these field names from being seen when serialized. However, this could still be accomplished with JSON tags like:

type Directory struct {
	Node `json:",inline"`
	DirectoryEmbedded1 `json:",inline"`
}

Would this change be possible? It would fix errors we are seeing, while still serializing these field names as "invisible" in the JSON

Review config/v3_0/types/schema.go, especially Directory and its embedded fields, and check how the Kubebuilder generator reports fields without JSON tags. Confirm whether adding tags preserves the intended invisible JSON serialization, then validate that the generator no longer reports the cited error; the issue does not name a test.