I am providing smtp configuration through values.yaml but the grafana not able to take this settings

Provided smtp configuration through values.yaml like

{ 
"grafana.ini":{ 
     "smtp": {
     "enabled": true, 
     "host" : "smtp.mailtrap.io:25", 
     "user" : "username", 
     "password" : "password" 
             } 
              } 
}

used below cmd to install the charts

helm install stable/prometheus-operator --name prometheus-operator --namespace monitoring -f values.yaml

after updating values the grafana should be able to send email but i see http://localhost:3000/admin/settings is not updated with values provided from values.yaml file