Cannot get candidate's application current stage interview information when call GetCandidate API

[xiaoyunzhang]

https://developers.greenhouse.io/harvest.html#get-retrieve-candidate
GET https://harvest.greenhouse.io/v1/candidates/{id}

when we working on our api to use the get candidate api to get candidate's application current stage and interviews under current stage, but we found in the current_stage object of the API response, we only see the current stage id and current stage name, and there is no interviews information returned.

How can we get candidate application's current stage interview information?
Thanks