I would like to create below message with esql , Is it possible with esql?

 '{
  "query": "mutation ExampleVaultSimple($input: VaultPaymentMethodInput!) {
    vaultPaymentMethod(input: $input) {
      paymentMethod {
        id
        usage
        details {
          __typename
        }
      }
      verification {
        status
      }
    }
  }",
  "variables": {
    "input": {
      "paymentMethodId": "id_of_single_use_payment_method"
    }
  }
}'

Yes, it is, but never tried myself.

https://www.ibm.com/docs/en/app-connect/12.0?topic=esql-manipulating-messages-in-blob-domain

In the past I used ESQL BLOB for HTML documents. It will work with any text format including GraphQL