Automation trigger on a templated entity - is there a way?

@klogg wrote:

Background

I use weather info in my garden irrigation package and I’d like to be able to change the weather data provider on the fly.

Question

I am well able to write everything in the package to adjust itself based on which from a variety of sensors has been selected through the package’s Lovelace UI…

…except for automations that need to be triggered on a state change of that sensor.

e.g.

    trigger:
      - platform: state
        entity_id:
          - sensor.dark_sky_daytime_high_temperature_0d

What I’d like to achieve is something like this which obviously won’t work, but is there a technique someone knows that can achieve this?

    trigger:
      - platform: state
        entity_id:
          - {{ states('input_text.weather_provider') }}

The state of input_text.weather_provider would, to match the original example above be, ‘sensor.dark_sky_daytime_high_temperature_0d’.

I’m well aware the answer is likely to be ‘no’, but it is usually worth asking!

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