I need help to implement this scenario.
If assignee isn't available or he is on leave. Ticket will automatically assign to the his proxy.
how to implement this with the help of script-runner or with any JIRA functionality.
How does Jira know that a person is on leave? When do you want this automation to happen?
You can use escalation service of script runner .
https://scriptrunner.adaptavist.com/5.0.2/jira/escalation-service.html
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