AndreKR-

Are there though?

Any ESP8266-based or Zigbee smartplug will do. If you get an ESP8266-based one, get one that comes with Tasmota preinstalled, then you don't need to open it up and flash it. Don't get an ESP32-based one.

If you run Tasmota or use a Zigbee plug, you need to do the detection in Home Assistant or Node-RED or whatever you're using. Personally I do it directly in ESPHome:

binary_sensor:
  - platform: analog_threshold
    id: machine_running
    name: "Washer running"
    icon: mdi:washing-machine
    sensor_id: power
    threshold: 5
    filters:
      - delayed_on_off: 60s

You know, the rest of us are using a smart plug with energy metering to find out if the dryer is finished.