Support "reverse-position" option for formatting and secondary_info

[myhomeiot]

In home assistant cover position it's a value from 0 to 100 which shows how much cover/blind/awning is open, for example 100 mean fully open. For many users this representation it's not native and they prefer to see how much cover is closed, for example 0 for fully open and 100 for fully close. In order to do it we need to make sensor for every cover which will subtract current position from 100:

    cover_living_room_current_position:
      friendly_name: Cover Living Room Current Position
      unit_of_measurement: '%'
      icon_template: 'mdi:blinds'
      value_template: "{{ 100 - state_attr('cover.living_room', 'current_position') }}"

It's will be very useful to have this reverse-position option for formatting and secondary_info which will do this calculation (100 - current_position).

Update: HA secondary_info also support the tilt-position but I'm not sure if it's required reverse equivalent probably, it's will be good to have for consistency.

[benct]

This card also supports tilt-position so you could try, but I'm also not sure it will work. I'll have a look at adding a "reverse" option.

[myhomeiot]

This card also supports tilt-position so you could try, but I'm also not sure it will work. I'll have a look at adding a "reverse" option.

In my case tilt-position return empty value. And cover has only following properties:

current_position: 100
friendly_name: Living Room
supported_features: 7
icon: mdi:blinds

[benct]

Formatting option for (reversed) position added in version 4.4.0.

attribute: current_position
format: position