Describe response item activities

gistfile1.txt

{
    "item": [
        136
    ],
    "product": 46575,
    "meta": {
        "pk": 9096,
        "blocked": 1553312,
        "user": 50962,
        "unblocked": false,
        "item": 1553316
    },
    "user": 50962,
    "identifier": 9096,
    "created": "2017-07-24T08:10:09+00:00",
    "action": "block",
    "label": "blocking",
    "id": 9616425,
    "cls": "Block"
}

• Value of item in meta is item.pk, but in result of api search item not contain field item.pk. So i can not get right item number for purpose show reference link item in activities.