artifactub folder is where all subchart’s helm package version being saved.
Because this repo is linked in (artifacthub.io), (artifacthub.io) will read all .tgz file in artifacthub folder so all subchart in here will be public on internet.
You can find grafana subchart on (artifacthub.io) by searching “SVTECH Public Helm Charts” then find “grafana” on (artifacthub.io).
Example result for grafana subchart (https://artifacthub.io/packages/helm/svtech-public-helm-charts/grafana).
Below is how to install grafana subchart:
helm repo add svtech-public-helm-charts https://svtechnmaa.github.io/charts/artifacthub/
helm install my-grafana svtech-public-helm-charts/grafana --version 1.0.0