is easy, even if your friendly AI tells you otherwise
While not mentioned in the docs explicitly,
it is still there in the code (or, well, at least chart's values.yaml),
and TL;DR is that to run ingress-nginx as DaemonSet,
you can simply set
controller:
kind: DaemonSet
in your values.yaml
(or what you have, maybe helmfile values: parameter)
for the ingress-nginx chart.