How to define that all parameters in openapi schema are required?

Question

Using openapi I can define some parameters to be required, example from documentation:

paths:
  /survey:
    post:
      requestBody:
        required: true
        content:
          application/x-www-form-urlencoded:
            schema:
              type: object
              properties:
                name:          # <!--- form field name
                  type: string
                fav_number:    # <!--- form field name
                  type: integer
              required:
                - name
                - email

Here 'name' and 'email' are required. Is it possible to set all parameters to be required, without naming them? Something like 'required_all: true'

When I have more parameters, it would be useful.