Problem in building a JSON list of data

@RalfP wrote:

Hi folks,

after a long time of stability in my config I’m trying to do a new move.
As I’m changing my power supplier to aWattar I can read the hourly prices of electricity. So far, so good.

Now I want to put a part of the values to a simple list like this:

{"data":[21.2,22.3,17.5,...]} 

I want to use this list as JSON table in Node-Red later on.
I have all the single values and the calculation model is right.
It’s just a problem in building the list…

#aWattar Strompreise
  - platform: rest
    resource: https://api.awattar.de/v1/marketdata
    name: "awattar"
    value_template: "{{ (value_json.data[0]) }}"
    json_attributes:
      - data
    scan_interval: 60
  - platform: template
    sensors:
      awattar_json:
        friendly_name: "aWattar JSON table"
        value_template: >-
          {% set awattar_json =
            {"data":
            {
            ((((state_attr('sensor.awattar', 'data')[0].marketprice)|float*100)/1000) | multiply(1.19)  + 19.22) |round(2),
            ((((state_attr('sensor.awattar', 'data')[1].marketprice)|float*100)/1000) | multiply(1.19)  + 19.22) |round(2),
            ((((state_attr('sensor.awattar', 'data')[2].marketprice)|float*100)/1000) | multiply(1.19)  + 19.22) |round(2),
            ((((state_attr('sensor.awattar', 'data')[3].marketprice)|float*100)/1000) | multiply(1.19)  + 19.22) |round(2),
            ((((state_attr('sensor.awattar', 'data')[4].marketprice)|float*100)/1000) | multiply(1.19)  + 19.22) |round(2)
            }}
          %}

I’ve been fiddeling around with this now for two days in a row but I only get any result if I build up the list like this:

{"0":"22.3",'"1":"23.8","2":"17.5",...}

This format I can’t get my head around in Node-Red for further processing. Basically I want to search for minima, 2 hours in a row minima, 3 hours in a row minima, …

With the current extract from my config I get the following error message (not unexpected):

Failed config
  sensor.template: 
    - Invalid config for [sensor.template]: invalid template (TemplateSyntaxError: expected token ':', got ',') for dictionary value @ data['sensors']['awattar_json']['value_template']. Got '{% set awattar_json =\n  {"data":\n  {\n  ((((state_attr(\'sensor.awattar\', \'data\')[0].marketprice)|float*100)/1000) | multiply(1.19)  + 19.22) |round(2),\n  ((((state_attr(\'sensor.awattar\', \'data\')[1].marketprice)|float*100)/1000) | multiply(1.19)  + 19.22) |round(2),\n  ((((state_attr(\'sensor.awattar\', \'data\')[2].marketprice)|float*100)/1000) | multiply(1.19)  + 19.22) |round(2),\n  ((((state_attr(\'sensor.awattar\', \'data\')[3].marketprice)|float*100)/1000) | multiply(1.19)  +.... (See ?, line ?).

Any simple example in how to build a list is highly appreciated, I’ve read the doc on templates over and over again now. When the list is filled I’ll probably have to use the “to_json” filter. But that’s part two of the cake…

Best regards
Ralf

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