Alexa shutter - configuration problem

Hi guys, I integrated my roller shutter on Alexa via home assistant

When I go to the shutter inside Alexa it shows me the percentage and ok, but it appears “turn on” and “turn off” and not “closed” and “open”, so it only works if I say “Alexa, turn off roller shutter” (closes the shutters 100%), or if I say “Alexa, turn on shutter” (they are fully open), how can I set to tell Alexa that they are shutter and not covers ?, so that I can say “Alexa, lower the shutter” or "Alexa raise the shutter " or “Alexa lower shutter to 34%” and so on …

# ALEXA & API #
alexa:
  smart_home:
    filter:
      include_entities:
        - cover.sonoff_10012b9efa
    entity_config:
      cover.sonoff_10012b9efa:
        name: "Tapparella finestra salotto"
        description: "Tapparella della finestra in salotto"
        display_categories: COVER