Accessing "includeFields" from WebhookSubscription using Koa Webhook

[w1am]

I am using Next JS, GraphQL and Koa to build a connector for Shopify. I want to send additional data to koa and saw includeFields on the shopify API page.

Here is what my webhook creation gql looks like:

const SUBSCRIBE = gql`
  mutation webhookSubscriptionCreate {
    webhookSubscriptionCreate(
      topic: BULK_OPERATIONS_FINISH
      webhookSubscription: {
        format: JSON,
        callbackUrl: "${process.env.KEY}/bulk",
        includeFields: ["hello world"]
      }
    ) {
      userErrors {
        field
        message
      }
      webhookSubscription {
        id
      }
    }
  }
`

Notice the field includeFields which I'd like to use to send additional data to koa. 

Then I run a bulk operation:

export const PRODUCT_BULK_OPERATION = () => {
  return gql`mutation bulkOperationRunQuery {
    bulkOperationRunQuery(query: """
      {
        products(first: 10) {
          edges {
            cursor
            node {
              title
              id
            }
          }
        }
      }
      """
    ) {
      bulkOperation {
        id
        status
      }
      userErrors {
        field
        message
      }
    }
  }`;
};

and here is how I can receive the webhook:

import { receiveWebhook } from '@shopify/koa-shopify-webhooks';

 const webhook = receiveWebhook({
  secret: process.env.SECRET
})

router.post("/bulk", webhook, async (ctx) => {
  try {
    // Tried
    console.log("ctx.request.body", ctx.request.body)
    console.log("ctx.state.webhook", ctx.state.webhook)

    await Shopify.Webhooks.Registry.process(ctx.req, ctx.res);
    console.log(`Webhook processed, returned status code 200`);
  } catch (error) {
    console.log(`2) Failed to process webhook: ${error}`);
  }
});

The data I get from the terminal:

ctx.request.body {
  admin_graphql_api_id: 'gid://shopify/BulkOperation/00000000000',
  completed_at: '2021-12-06T22:24:25+04:00',
  created_at: '2021-12-06T22:24:24+04:00',
  error_code: null,
  status: 'completed',
  type: 'query'
}
ctx.state.webhook {
  topic: 'BULK_OPERATIONS_FINISH',
  domain: 'dev-store.myshopify.com',
  payload: {
    admin_graphql_api_id: 'gid://shopify/BulkOperation/00000000000',
    completed_at: '2021-12-06T22:24:25+04:00',
    created_at: '2021-12-06T22:24:24+04:00',
    error_code: null,
    status: 'completed',
    type: 'query'
  }
}

As you can see, it does not return includeFields in koa. I tried using cookies before to send the same data from Next JS but It didn't work either.

Because bulk operations are only available in GraphQL, I believe this question is more linked to GraphQL. However, if somebody has done this in REST with another webhook subscription topic, please leave a comment.

Any suggestions?