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Yes you can customize the helm chart with https://docs.k3s.io/helm#customizing-packaged-components-with-helmchartconfig

Thank you Derek? I have created

/var/lib/rancher/k3s/server/manifests/traefik-config.yaml

with the contents:

apiVersion: <http://helm.cattle.io/v1|helm.cattle.io/v1>
kind: HelmChartConfig
metadata:
  name: traefik
  namespace: kube-system
spec:
  valuesContent: |-
    additionalArguments:
      - '--providers.kubernetesingress.allowemptyservices=true'
      - '--providers.kubernetesingress.allowexternalnameservices=true'
      - '--providers.kubernetescrd.allowemptyservices=true'
      - '--providers.kubernetescrd.allowexternalnameservices=true'

So hopefully at the next Træfik update Helm will include these. I just did an upgrade from 1.28.10 to 1.29.5 but they had the same version of Træfik.