theme_region_wrapper-1.0.x-dev/config/schema/theme_region_wrapper.schema.yml

theme_region_wrapper.settings:
  type: config_object
  label: 'Theme region wrapper settings'
  mapping:
    wrapper_elements:
      type: sequence
      label: 'Region wrapper elements'
      sequence:
        type: string
        label: 'Element'

theme_settings.third_party.theme_region_wrapper:
  type: sequence
  label: 'Regions settings'
  sequence:
    type: theme_settings.third_party.theme_region_wrapper.[%key]

theme_settings.third_party.theme_region_wrapper.*:
  type: mapping
  label: 'Region settings'
  mapping:
    element:
      label: 'Element'
      type: string
    classes:
      label: 'CSS classes'
      type: string
    aria_role:
      label: 'WAI-ARIA role'
      type: string