Issue : Ability to have IssueFunction, IssueInEpics keywords supported in issue search JQL

Summary :
Presently, it's possible to run JQL query with IssueFunction and IssueInEpics keywords directly via JIRA
This affects customers, especially those who are moving via server to the cloud.
At times we need to rely on add ons to see if this functionality can be used.

Expected:
To have this feature within Jira