How to use "CurrentIssue" in JQL in the Scriptrunner behaviours function.

[Paul Wilkinson]

I am using the Scriptrunner Behaviours function to filter issues in fields

Can anyone please suggest how to write a JQL able to find all the Business and Functional Requirements of the EPIC.

Something like this:

Issuetype in ("Functional Requirement","Business Requirement") AND "Epic Link" = currentIssueKey

thanks