I am trying to customize the subject for emails sent from Grafana alerts.
Is there any possible way to achieve it in Grafana v8.2.1?
welcome to the 
community @nithins!
There’s not currently a way to do this, though it already exists for the slack contact point. There are some new features in discussion here and here.
@nithins good news! We’re adding support for this soon!
#49742 Alerting: Add templated subject config to email notifier