Returning a list from a template

@luma wrote:

I’m trying to figure out how to get a template to produce a list that can be consumed as a list by a service call. Specific case right now is to enumerate a list of scenes, and send that list to an input_select as a list of available options

Currently, this is what I have:

  - service: input_select.set_options
    data_template:
      entity_id: "input_select.hasp_plate01_page1button4scene"
      options: "[{% for item in states.scene %}'{{ item.entity_id }}'{% if not loop.last %}, {% endif %}{% endfor %}]"

That template renders as ["scene.daylight", "scene.lights_off", "scene.lights_on", "scene.night"] which, if pasted into the service call, works like expected. However, I’m pretty sure it’s just rendering as a long string and I think I need it to somehow be returning a list.

Is this possible?

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