REST API call and use EFF in the query field parameter

Summary:

Hi,

We are trying to query data base in a specific field in EFF.

https://XXXXXX.oraclecloud.com/hcmRestApi/resources/latest/positions?q=PositionCode='114790' AND extraInformation.PositionExtraInfoDeveloperFlexVacancyRequisitionprivateVO.requisitionReference='11652'

I saw this article that this is not possible in EXPAND, is it also the same when we use it in the query parameter?
https://community.oracle.com/customerconnect/discussion/813711/cannot-expand-workers

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