cart.js
import { gql, useQuery } from '@apollo/client'

const GET_CART_QUERY = gql`
  query cart {
    id
    products {
      id
      quantity
      brandName
      itemName
      stockText @client
    }
  }
`

const { loading, data, error } = useQuery(GET_CART_QUERY)

Invoking query

inside a React component

Apollo Client will

resolve stockText on the client-side