How to Auto assign issues to "Assignee" in "JSM" based on Automation with Groovy Scripting

[Syed Javeed Ahammad]

How to Auto assign issues to "Assignee" in "JSM" based on Automation with Groovy Scripting

based on Category and Subcategory cascading Field

Example

 if Category ("ABC") and Subcategory ("EFG") Selected then "abc@xyz.com" should add as "Assignee" in Ticket