tinyusb:

tinyusb_keyboard:
  id: kb

binary_sensor:
  - platform: template
    id: kb_letter
    on_press:
      - tinyusb_keyboard.press:
          id: kb
          key: a
    on_release:
      - tinyusb_keyboard.release: kb

  - platform: template
    id: kb_shift_digit
    on_press:
      - tinyusb_keyboard.press:
          id: kb
          key: "1"
          modifiers: 0x02  # Left Shift
    on_release:
      - tinyusb_keyboard.release: kb

  - platform: template
    id: kb_raw_code
    on_press:
      - tinyusb_keyboard.press:
          id: kb
          key: 0x28  # Enter
          modifiers: !lambda return 0;
    on_release:
      - tinyusb_keyboard.release: kb

  - platform: template
    id: kb_volume_up
    on_press:
      - tinyusb_keyboard.media_press:
          id: kb
          usage: 0xE9  # Volume Up
    on_release:
      - tinyusb_keyboard.media_release: kb