We can use the OperatorHub in Red Hat Openshift to install the Grafana-operator. I have logged in as kubeadmin user,and navigate to the OperatorHub and search for Grafana
We need to create a CR(custom resource) for Grafana to create a Grafana instance in the Grafana tile click on the create instance link
In the Data Source form in the HTML section add url for the Prometheus service.