voc_charging_notification.yaml

blueprint:
  name: Notify when car is charging
  description: Send push notification when the car is plugged in and have started charging
  domain: automation
  input:
    battery_charging:
      name: Car battery charging sensor
      selector:
        entity:
          domain: binary_sensor
          device_class: plug
    battery_range:
      name: Car battery range sensor
      selector:
        entity:
          domain: sensor
    battery_level:
      name: Car battery level
      selector:
        entity:
          domain: sensor
    time_to_fully_charged:
      name: Time until battery is fully charged
      selector:
        entity:
          domain: sensor
    notify_device:
      name: Device to notify
      description: Device needs to run the official Home Assistant app to receive notifications.
      selector:
        device:
          integration: mobile_app

trigger:
- entity_id: !input battery_charging
  platform: state
  for: 00:00:05
  from: 'off'
  to: 'on'
- entity_id: !input battery_charging
  from: 'on'
  platform: state
  to: 'off'

variables:
  ch_time: !input time_to_fully_charged
  charging_time: "{{ states(ch_time) }}"
  b_range: !input battery_range
  battery_state: "{{ states(b_range) }}"
  b_level: !input battery_level
  battery_level: "{{ states(b_level) }}"

action:
  domain: mobile_app
  type: notify
  device_id: !input notify_device
  message: >-
    {% if trigger and (trigger.to_state.state == 'on') %}
    The car is currently charging, will finish at
    {{- (now() | as_timestamp() + (charging_time|int * 60)) | timestamp_custom(" %H:%M", True) }}
    {{- (-3600 + (charging_time|int * 60)) | timestamp_custom(" (%-H h %-M min).", True) }}
    {%- else %}
    Finished charging, battery at {{ battery_level }}%, ({{ battery_state }} km).
    {%- endif %}
  title: Car charging time

Work in progress, the message needs some magical formatting..