I have created this folder to make life easier. It will never be updated and I would really recommend you using the official grafana operator repo instead.
Read through the instructions in grafana/README.md and update the values.yaml file
But this should do the job.
oc new-project grafana
oc apply -f grafana-operator
cd grafana
# Update the values.yaml
sleep 5 # Giving the operator some time to start
helm install grafana .