helmchart as yaml via helm controller https://github.com/k3s-io/helm-controller#helm-controller

longhorn.yaml

---
apiVersion: helm.cattle.io/v1
kind: HelmChart
metadata:
  namespace: kube-system
  name: longhorn-crd
spec:
  targetNamespace: longhorn-system
  createNamespace: true
  version: 105.1.0+up1.7.2
  chart: longhorn-crd
  repo: https://charts.rancher.io
---
apiVersion: helm.cattle.io/v1
kind: HelmChart
metadata:
  namespace: kube-system
  name: longhorn
spec:
  targetNamespace: longhorn-system
  createNamespace: true
  version: 105.1.0+up1.7.2
  chart: longhorn
  repo: https://charts.rancher.io