REST API v1 CoGroupMember response does not contain group id

[Request] GET https://comanage-registry:443/registry/co_group_members/1.json

[Request Headers] {"Content-Type":"application/json"}

[Page] https://comanage-registry:443/registry/co_group_members/1.json

[Response] 200

{

  "ResponseType": "CoGroupMembers",

  "Version": "1.0",

  "CoGroupMembers": [

    {

      "Version": "1.0",

      "Id": 1,

      "Person": {

        "Type": "CO",

        "Id": 1

      },

      "Member": true,

      "Owner": false,

      "Created": "YYYY-MM-DD hh:mm:ss",

      "Modified": "YYYY-MM-DD hh:mm:ss",

      "Revision": 0,

      "Deleted": false,

      "ActorIdentifier": "Shell user \"root\""

    }

  ]

}