Support ">=" operators in dateCompare

Problem

i'm doing this JQL request :

issueFunction in dateCompare("", "Operations end date >= Operation start date +3w")

and i got this error message :

Scripted function "dateCompare" compilation failure. Contact administrator and check logs. Message: Field name: Operations end date > not found or not a date or datetime.

but "Operations end date" is a the right name of one of my datetime customfied ... I have try with other date or datetime customfields but always the same kind of message ... it work with system date or date time customfield ...

Suggestion

It would be great to support ">=" or "<=" operators like JIRA JQL functions.