Rest sensor with attributes

Configuration
1

I would like to define some new sensors, but with only one rest call. Result is

{
    "devices": [{
        "deviceID": "abc",
        "measurement": {
            "id": "fsdafsdfdsafsd",
            "deviceID": "abc",
            "timestamp": "2026-06-09T13:24:34Z",
            "lowBattery": false,
            "transmissionCounter": 12033,
            "sensorValues": [{
                "value": 4.7,
                "valueType": 0,
                "noConnection": false,
                "overflow": false
            }],
            "created": "2026-06-09T13:24:40.7865701Z"
        }
    }, {
        "deviceID": "def",
        "measurement": {
            "id": "fsdafsdfa",
            "deviceID": "der",
            "timestamp": "2026-06-09T13:23:18Z",
            "lowBattery": false,
            "transmissionCounter": 12033,
            "sensorValues": [{
                "value": -20.700000000000003,
                "valueType": 0,
                "noConnection": false,
                "overflow": false
            }],
            "created": "2026-06-09T13:23:24.363331Z"
        }
    }, { ...

But currently all my ideas are stuck.

#       - name: "TFA Sensor Gerät abc"
#         unique_id: sensor_geraet_BC
#         value_template: >
#           {% set device = value_json.devices | selectattr('deviceID', 'eq', 'BC') | first %}
#           {{ device.measurement.sensorValues[0].value | round(2) if device is defined else 'unknown' }}
#         attributes:
#           low_battery: >
#             {% set device = value_json.devices | selectattr('deviceID', 'eq', 'BC') | first %}
#             {{ device.measurement.lowBattery if device is defined else 'unknown' }}

is not working, because attributes seems not be supported here.

      - name: SensorHub
        value_template: "{{ value_json.generated }}"
        json_attributes:
          - devices

with template sensors afterwards not working either and bringing back only first device

Using single paths seems only to work wtth 0, 1, 2, but if this is not stable

      - name: TFA abc
        value_template: "{{ value_json.devices[1].measurement.sensorValues[0].value }}"
        json_attributes_path: "$.devices[1].measurement"
        json_attributes:
          - lowBattery

json_attributes_path: "$.devices[?(@.deviceID=='abc')].measurement"

Such filters are supported and only do not work here?

Any hint or idea?

2

way 3: o.k. filter seems to work. Done.

and second case was my fault as well. There were still a payload used for singe device. omg.

    value_template: >
      {% set dev = value_json.devices
        | selectattr('deviceID', 'eq', 'abc')
        | first %}
      {{ dev.measurement.sensorValues[0].value }}
    json_attributes_path: "$.devices[?(@.deviceID=='abc')].measurement"
    json_attributes:
      - lowBattery
      - deviceID