K8s , Vault Agent Injector .. agent-inject-file-SECRET: /custom/path/secret not working as expected

There is an agent-inject-file-$SECRET_NAME: $CUSTOM_PATH but I feel the implementation does not match the expectation of the override.

If I understand this correctly inject-file annotation will let you define a custom subpath but the filename will still be the secret name.
Also it is unclear if there is any additional configuration/code needed to make sure that the agent container can or will create/write to subdirectories of /vault/secrets “/vault/secrets/custom/path/custom-file-name”
Our intention of trying to use the inject file annotation is to mirror the Vault path of the secret in the path used by the agent - “/vault/secrets////”