manage_display_extras-8.x-1.0-beta2/config/schema/manage_display_extras.schema.yml

field.formatter.settings.title_with_classes:
  type: mapping
  label: Title with classes formatter settings
  mapping:
    linked:
      type: boolean
      label: 'Linked'
    tag:
      type: string
      label: 'Tag'
    classes:
      type: string
      label: Classes