Home Assistant Blueprint: Notify or do something when an appliance like a dishwasher or washing machine finishes

notify-or-do-something-when-an-appliance-like-a-dishwasher-or-washing-machine-finishes.yaml

blueprint:
  name: Appliance has finished
  description: Do something when an appliance (like a washing machine or dishwasher)
    has finished as detected by a power sensor.
  domain: automation
  input:
    power_sensor:
      name: Power Sensor
      description: Power sensor entity (e.g. from a smart plug device).
      selector:
        entity:
          domain: sensor
    starting_threshold:
      name: Starting power threshold
      description: Power threshold above which we assume the appliance has started.
      default: 5
      selector:
        number:
          min: 1.0
          max: 100.0
          unit_of_measurement: W
          mode: slider
          step: 1.0
    starting_hysteresis:
      name: Starting hysteresis
      description: Time duration the power measurement has to stay above the starting
        power threshold.
      default: 5
      selector:
        number:
          min: 0.25
          max: 60.0
          unit_of_measurement: min
          mode: slider
          step: 0.25
    finishing_threshold:
      name: Finishing power threshold
      description: Power threshold below which we assume the appliance has finished.
      default: 5
      selector:
        number:
          min: 1.0
          max: 100.0
          unit_of_measurement: W
          mode: slider
          step: 1.0
    finishing_hysteresis:
      name: Finishing hysteresis
      description: Time duration the power measurement has to stay below the finishing
        power threshold.
      default: 5
      selector:
        number:
          min: 0.25
          max: 60.0
          unit_of_measurement: min
          mode: slider
          step: 0.25
    actions:
      name: Actions
      description: Actions (e.g. pushing a notification, TTS announcement, ...)
      selector:
        action: {}
    pre_actions:
      name: Actions
      description: Actions when starting threshhold is crossed
      selector:
        action: {}
  source_url: https://gist.github.com/sbyx/6d8344d3575c9865657ac51915684696
trigger:
- platform: numeric_state
  entity_id: !input 'power_sensor'
  for:
    minutes: !input 'starting_hysteresis'
  above: !input 'starting_threshold'
condition: []
action:
- choose: []
  default: !input 'pre_actions'
- wait_for_trigger:
  - platform: numeric_state
    entity_id: !input 'power_sensor'
    below: !input 'finishing_threshold'
    for:
      minutes: !input 'finishing_hysteresis'
- choose: []
  default: !input 'actions'
mode: single
max_exceeded: silent

One more question.
I want to add to the notification the following information:

1. Duration (in minutes)
2. Total power consumption

I want the action to look something like:

action:
  service: telegram_bot.send_message
  data:
    target: !input telegram_chat_id
    message: >
      Appliance has finished running for {{ time_running }} with a power consumption of {{ power_consumed }}.

Anyone has any idea if and how could this be possible?
I thought of adding within the pre_actions a set for a time helper sensor.
But I have no idea how to:

1. Calculate the duration between times
2. Calculate the total consumption