vacuum:
  - platform: xiaomi_miio
    host: 192.168.1.2
    token: YOUR_TOKEN

vacuum_kitchen:
  alias: "Clean the kitchen"
  sequence:
    - service: vacuum.send_command
      data:
        entity_id: vacuum.xiaomi_vacuum_cleaner
        command: app_segment_clean
        params: [18]

Where params specify room numbers, for multiple rooms, params can be specified like [17,18].

Reference to vacuum_xiaomi_miio