C++ JSON Memory Management?

When constructing JSON parameter for Dropbox endpoint /upload_session/append_v2:

    CkJsonObject jsonParams;
    jsonParams.AddObjectAt(-1, “cursor");
    CkJsonObject *jsonCursor = jsonParams.ObjectOf(“cursor");
    jsonCursor->AddStringAt(-1, "session_id", sessionIdStr);

jsonParams correctly ends up with a nested “cursor” object containing “session_id”. So it appears that jsonParams and jsonCursor shares some memory. So we aren’t sure if we should we explicitly delete jsonCursor, or just let jsonParams goes out of scope and destructs.