How to use a template to show first item in a list in a custom state card?

Configuration
3

Thanks for the reply, here’s my code:

#configuration.yaml
frontend:
  extra_html_url:
    - /local/custom_ui/state-card-crypto_profit.html

sensor:
  - platform: rest
    name: Miners
    resource: http://192.168.1.106:17790/api/miners
    json_attributes: 
      - groupList
    value_template: '{{value_json.totalHashrate5s}}'
  - platform: template
    sensors:
      miner_data:
        friendly_name: 'Miner Data'
        value_template: '{{ states.sensor.miners.attributes["groupList"] }}'

#customize.yaml
    sensor.miners:
      custom_ui_state_card: state-card-crypto_profit

#groups.yaml
  dashboard:
    name: Dashboard
    entities:
      - sensor.miners

You could be right that it doesn’t support Jinja, since I used the idea from This thread on the forum and they use this code to loop through an object:

        <template is="dom-repeat" items="{{stateObj.attributes.next_trains}}">

However my issue is still that I can’t get item [0] of the groupList which is a list, and I need to loop through that, either using a for loop or the template dom-repeat as above.

Thank you in advance!