Those extra annotations work only if you use Ingress controller such as ingress-nginx. You have to have it installed and configured on your Kubernetes cluster.
Additionally, the rasa-x helm chart settings for ingress-nginx look like this.
For example:
nginx:
enabled: false
ingress:
annotations:
kubernetes.io/ingress.class: nginx
nginx.ingress.kubernetes.io/whitelist-source-range: "x.x.x.x/x"
hosts:
- host: example.com
paths:
- /