Is Restful data_template possible?

Hi all,

I am looking for a way to get variables in my data_template to come from a REST call. Is it possible?

Basically :

script:
  message_news:
    sequence:
      - service: script.my_news
        data_template:
          message: The news is {{ REST_CALL_SHOULD_BE_HERE }}

I know I can have a RESTful sensor, so I can probably try to fake it via making a RESTFUL Sensor to carry the state of the text I want to pull… But this seem very akward… Would it work for very long string? Also, I am not sure if I can control how often the RESTFul sensor polls REST endpoint for updates? I need the REST service to be hit at the moment of script execution … Will below actually work?

   script:
      message_news:
        sequence:
          - service: script.my_news
            data_template:
              message: The news is {{ states.sensor.my_news.state }}

Is there a better way of doing this?