mutation CreateConversationBookmark($input: CreateConversationBookmarkInput!) {
  createConversationBookmark(input: $input) {
    clientMutationId
    conversation {
      avatarUrls
      bookmarkedAt
      id
      lastChatAt
      lastReadMessage {
        actorType
        artifact {
          __typename
        }
        assets {
          __typename
        }
        chatCard {
          __typename
        }
        createdAt
        lastReplyAt
      }
      memberCount
    }
    errors
  }
}

{
  "input": {
    "conversationId": "id"
  }
}

{
  "data": {
    "createConversationBookmark": {
      "clientMutationId": "string",
      "conversation": {
        "avatarUrls": [
          "string"
        ],
        "bookmarkedAt": "value",
        "id": "id",
        "lastChatAt": "value",
        "lastReadMessage": {
          "actorType": "COHOST",
          "artifact": {
            "__typename": "Artifact"
          },
          "assets": [
            {
              "__typename": "Asset"
            }
          ],
          "chatCard": {
            "__typename": "ChatCard"
          },
          "createdAt": "value",
          "lastReplyAt": "value"
        },
        "memberCount": 1
      },
      "errors": [
        "string"
      ]
    }
  }
}