The current Helm chart has only the possibility to create a ingress, a cluster IP or a Load Balancer Object.
In order to have a clean separation in between the Load Balancer and the Ingress, it would make sense to offer a easy to use solution to include the nginx-ingress helm chart as a dependency
Include dependency to nginx-ingress as optional point to the Helm chart. The mechanism for the bitnami.postgresql helm chart can be reused here.
The template to create a ingress record might needs to be adapted as well