Currently, we use envs(plural) to define the list for environment variables, although that is correct in k8s native objects it is env(singular) which defines the same list.
See: https://kubernetes.io/docs/tasks/inject-data-application/define-environment-variable-container/

At this moment it is highly unlikely that k8s will change that, so it is better for us to change and be similar to k8s native way.