official ref

Query with Input

const PERSONS_QUERY = gql`
{
  persons(
    storeInfo: {
      alias: "testStore"
    }
  ){
    id
    name
    #...
}
`

this works same as we do in PlayGround but if I want to use programmatic parameter

const PERSONS_QUERY = gql`
\!h query PersonsByStore($storeAlias: String!){
  persons(
    storeInfo: {
\!h       alias: $storeAlias
    }
  ){
    id
    name
    #...
  }
}