SCHEMA:

openapi: 3.1.0
info:
  title: Make.com Webhook Trigger
  description: Sends a newsletter or blog post (title, subtitle, body) to a Make.com webhook.
  version: 1.0.0
servers:
  - url: <https://hook.us1.make.com> //your base webhook URL
    description: Make.com Webhook Endpoint
paths:
  /14nfwe87popnkdeuaofuwcg4v3smyh1s: //your webhook url path
    post:
      operationId: sendPostToMake
      summary: Send blog or newsletter content to Make.com
      description: Triggers a Make.com webhook and passes the blog or newsletter content as JSON.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                title:
                  type: string
                  description: Title of the post
                subtitle:
                  type: string
                  description: Subtitle or summary of the post
                body:
                  type: string
                  description: Full content of the post (can be Markdown or HTML)
              required:
                - title
                - subtitle
                - body
      responses:
        '200':
          description: Webhook accepted the content
        '400':
          description: Invalid input data

Make.com Blueprint:

CustomGPT to Google Docs.json