issuekey in childIssuesOf(PORT-1, PORT-2) is not supported ?

[Anilkumar B]

i have a filter where i need to return a list of issuekeys from ES Portfolio project aswell as all connected child issues in each of the top issue (the Portfolio Epic)
here is my filter -

issuekey in  (EEEP-267, EEEP-133) OR issuekey in childIssuesOf(EEEP-133) AND fixVersion in (PI18C)

It works with only one issuekey for childissues Of, but when i enter

issuekey in childIssuesOf(EEEP-133, EEEP-267)

i get error "Function 'childIssuesOf' expected '1' arguments but received '2'." because the function wont take more than one argument. So how can i solve this.

[Sana Safai]

You can turn "issuekey in childIssuesOf(EEEP-133, EEEP-267)" into "issuekey in childIssuesOf(EEEP-133) OR issuekey in childIssuesOf(EEEP-267)"

[dan papuc]

what if the list of arguments is too long and dynamic ? (updates several times a day ...)