magento2 graphql per item discount code example

Example: magento2 graphql cart

{
  cart(cart_id: "REPLACE_CART_ID_HERE") {
    email
    billing_address {
      city
      country {
        code
        label
      }
      firstname
      lastname
      postcode
      region {
        code
        label
      }
      street
      telephone
    }
    shipping_addresses {
      firstname
      lastname
      street
      city
      region {
        code
        label
      }
      country {
        code
        label
      }
      telephone
      available_shipping_methods {
        amount {
          currency
          value
        }
        available
        carrier_code
        carrier_title
        error_message
        method_code
        method_title
        price_excl_tax {
          value
          currency
        }
        price_incl_tax {
          value
          currency
        }
      }
      selected_shipping_method {
        amount {
          value
          currency
        }
        carrier_code
        carrier_title
        method_code
        method_title
      }
    }
    items {
      id
      product {
        name
        sku
      }
      quantity
    }
    available_payment_methods {
      code
      title
    }
    selected_payment_method {
      code
      title
    }
    applied_coupons {
      code
    }
    prices {
      grand_total {
        value
        currency
      }
    }
  }
}