Use variables for automation triggers & conditions

I want to improve the efficiency of a script that manages a fan, and avoid repeating hard coded values.

So I tried to add variables:

alias: Ventilation SDB New
mode: restart
variables:
  max_dew: 14
  min_dew: '{{ max_dew - 0.2 }}'
  max_ext_dew: '10'
  ext_dew_limit: '{{ max_ext_dew - 0.2 }}'
description: Ventilation SDB
trigger:
  - platform: numeric_state
    entity_id: sensor.sdb_dewpoint
    above: '{{ max_dew }}'
    for:
      hours: 0
      minutes: 0
      seconds: 0
  - platform: numeric_state
    entity_id: sensor.sdb_dewpoint
    below: '13.8'
    for:
      hours: 0
      minutes: 0
      seconds: 0
  - platform: numeric_state
    entity_id: sensor.exterieur_dewpoint
    below: '10'
  - platform: numeric_state
    entity_id: sensor.exterieur_dewpoint
    above: '20'
  - platform: event
    event_type: homeassistant_start
action: null

In the first ‘above’ parameter in the sample code, I have written above: '{{ max_dew }}', but the UI complains with “Message malformed: expected float for dictionary value @ data[‘above’]” . I also tried above: "{% max_dew | float %}" and other variations without success.

My intent is to reuse these variables in action conditions as well.

Is this possible? If yes, what is the right way to do it?

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