mutation productVariantsBulkCreate($productId: ID!, $variants: [ProductVariantsBulkInput!]!) {
  productVariantsBulkCreate(productId: $productId, variants: $variants) {
    product {
      id
      __typename
    }
    productVariants {
      id
      title
      __typename
    }
    userErrors {
      field
      message
      __typename
    }
    __typename
  }
}