mutation ChooseContactDuplicatePrimary($input: ChooseContactDuplicatePrimaryInput!) {
  chooseContactDuplicatePrimary(input: $input) {
    contactId
    primaryContactId
  }
}

{
  "input": {
    "contactId": "id",
    "primaryContactId": "id"
  }
}

{
  "data": {
    "chooseContactDuplicatePrimary": {
      "contactId": "id",
      "primaryContactId": "id"
    }
  }
}