Restore 'transition' in scenes

The use of other attributes than device state attributes is deprecated and will be removed in a future release. Invalid attributes are ['transition']. Read the logs for further details: https://www.home-assistant.io/integrations/scene/

This error show up in the logs because the transition, currently within the entity_id of a scene, will be removed soon in favor of the following syntax:

  action:
    service: scene.turn_on
    data:
      entity_id: scene.romantic
      transition: 2.5

The issue is, being this a scene, it would be much more useful if a scene that has lots of lights that should act in different ways, can be pre-written.
Please have a look at the example below.

Suppose you wake up in the night and want that a group of lights will turn on slowly, the following scene would apply:

- name: Living area slow
  entities:
    light.light_3:
      state: on
      brightness: 254
      color_temp: 443
      transition: 3
    light.light_2:
      state: on
      brightness: 254
      color_temp: 443
      transition: 5
    light.light_1:
      state: on
      brightness: 254
      color_temp: 443
      transition: 8

which will be called from the following automation:

- id: 'living area on slow'
  initial_state: true
  trigger:
  - platform: state
    entity_id: binary_sensor.bedroom_door_occupancy
    from: 'off'
    to: 'on'
  condition:
  - condition: state
    entity_id: input_boolean.it_is_night_and_we_sleep
    state: 'on'
  action:
  - service: scene.turn_on
    data:
      entity_id: living_area_slow

Using the new kind of scenes, that ‘action’ must be converted to (and suppose that light_x_slow exist) :

...
  action:
  - service: scene.turn_on
    data:
      entity_id: light_3_slow
      transition: 3
  - service: scene.turn_on
    data:
      entity_id: light_2_slow
      transition: 5
  - service: scene.turn_on
    data:
      entity_id: light_1_slow
      transition: 8

And that makes really little to less sense.

My request then is if the scenes may please have the transition back.

Thanks