Allow tokens when creating webhooks

Created on behalf of a Community post:

https://community.atlassian.com/t5/Jira-questions/Register-Jira-Cloud-Webhook-with-REST-API/qaq-p/1062717

I want to register an JIRA Cloud webhook via REST API (no connect apps). I have gone through the https://developer.atlassian.com/cloud/jira/platform/webhooks/
But it seems that it only supports basic auth during webhook registration.

What I want is to register an webhook with access token in header as 
Authorization : Bearer <access_token>
But when I do post it like above it always returns 401 status code.

Below is the configurations i am trying :

URL :

 https://<subdomain>.atlassian.net/rest/api/3/webhook

Headers : 

Authorization : Bearer <access_token>
Content-Type : application/json

Body : 

Unknown macro: { "name"}