Trying to create a new sensor from ESIOS REE API

Hi,

I am trying to create a sensor in order to manage the injection price for the electricity in Spain.

Esios REE is providing us an API in order to be able to manage some published electricity variables.

So, according to this, first I am creating a sensor using the platform REST.

- platform: rest
    name: PVPC Inyectado
    method: GET
    scan_interval: 600
    unit_of_measurement: "cts/kWh"
    resource: https://api.esios.ree.es/indicators/1739
    headers:
      Accept: application/json;application/vnd.esios-api-v1+json
      Content-Type: application/json
      Authorization: Token token=!secret esios_token
    value_template: >
      {%- set time = utcnow().replace(minute=0).replace(second=0).replace(microsecond=0) %}
      {%- set time = time.strftime("%Y-%m-%dT%H:%M:%SZ") %}
      {%- set selections = value_json.indicator.values | selectattr('datetime_utc','eq',time) | list %}
      {{ selections[0].value | float / 10 | round(5) if selections | length > 0 else 0.0 }}
    json_attributes_path: "$indicator.values"
    json_attributes:
      - value

Then I created another sensor using the platform TEMPLATE.

 - platform: template
    sensors:
      pvpc_inyectado_hoy:
        friendly_name: "PVPC Inyectado HOY"
        value_template: "{{ states('sensor.pvpc_inyectado') | float }}"
        unit_of_measurement: "cts/kWh"
        attribute_templates:
          pvpc_inyectado_00h: "{{ state_attr('sensor.pvpc_inyectado', 'value')[0].value | float }}"
          pvpc_inyectado_01h: "{{ state_attr('sensor.pvpc_inyectado', 'value')[1].value | float }}"
          
          # Repeat for every day hour up to 23h ...

          pvpc_inyectado_23h: "{{ state_attr('sensor.pvpc_inyectado', 'value')[23].value | float }}"

The new sensor “PVPC Inyectado HOY” is getting the state OK. So it is showing the correct value for the current hour.

But the sensor “PVPC Inyectado HOY” is saving the attribute with null values.

If I use a http node at Node Red … I am getting the following paths for

payload.indicator.values[0].value  / This is the path for "pvpc_inyectado_00h" attribute
payload.indicator.values[1].value /  This is the path for "pvpc_inyectado_01h" attribute
...
payload.indicator.values[23].value /  This is the path for "pvpc_inyectado_23h" attribute

Is there anything wrong at the REST platform sensor?

json_attributes_path: "$indicator.values"
json_attributes:
  - value