webp-8.x-1.0-beta4/config/schema/webp.schema.yml

webp.settings:
  type: config_object
  mapping:
    quality:
      type: integer
      label: 'Image quality'

imageapi_optimize.processor.webp_webp:
  type: mapping
  mapping:
    quality:
      label: 'Image quality'
      type: integer