How to generate a completable enum field description from .proto file?

[terloo]

I attempt to generate a openapi.yaml like this，(just an example)

parameters:
  - name: weather
    schema:
      type: integer
      format: int32
      enum:
        - 1
        - 2
        - 3
      x-enum-descriptions:
        - 'Blue sky'
        - 'Slightly overcast'
        - 'Take an umbrella with you'

But I only got

parameters:
  - name: weather
    schema:
      type: integer
      format: enum

or

parameters:
  - name: weather
    schema:
      type: string
      format: enum
      enum:
        - BLUE_SKY
        - XXXXX
        - YYYY

I can't found any openapi annotation for enum type, How can I do it ?