As a user I can filter, via a JQL Function: testExecutionTests, with Defect flag and all users

As a user I can filter, via a JQL Function: testExecutionTests, with Defect flag and all users

Today we have this: Enhanced querying with JQL 

Example: (6) issue in testExecutionTests('Saved Test Execution Filter','','user A', 'true')

Parameters:

P3 - User assigned to execute Test Run (Optional). If you pass "" as argument then the function will look for unassigned Test Runs

P4 - Defects Flag with value in true or false

And user would like to adjust this query with Defects Flag, so that get a list of all Tests and not only those executed by User A.