"Failed to convert extracted value to float64"

[Astu04]

docker-compose log:

json-exporter  | time=2025-03-29T12:58:03.636Z level=ERROR source=collector.go:68 msg="Failed to convert extracted value to float64" path={.devices[*]} value="{\"snet_time_ema\":3.141592653589793,\"snet_tries_10mins\":5} {\"snet_time_ema\":4.141592653589793,\"snet_tries_10mins\":3}" err="strconv.ParseFloat: parsing \"{\\\"snet_time_ema\\\":3.141592653589793,\\\"snet_tries_10mins\\\":5} {\\\"snet_time_ema\\\":4.141592653589793,\\\"snet_tries_10mins\\\":3}\": invalid syntax; strconv.ParseFloat: parsing \"{\\\"snet_time_ema\\\":3.141592653589793,\\\"snet_tries_10mins\\\":5} {\\\"snet_time_ema\\\":4.141592653589793,\\\"snet_tries_10mins\\\":3}\": invalid syntax" metric="Desc{fqName: \"snet_metrics\", help: \"snet_metrics\", constLabels: {}, variableLabels: {}}"

This is my json:

{
  "devices": [
    {
      "snet_time_ema": 3.14159265358979,
      "snet_tries_10mins": 5
    },
    {
      "snet_time_ema": 4.14159265358979,
      "snet_tries_10mins": 3
    }
  ]
}

This is my json_exporter config:

modules:
  test_module:
    metrics:
      - name: snet_metrics
        path: '{.devices[*]}'
        values:
          time_ema: '{.snet_time_ema}'
          tries_10mins: '{.snet_tries_10mins}'

And this is my prometheus.yml snippet:

  - job_name: 'test_module'
    metrics_path: /probe
    params:
      module: [test_module]
    static_configs:
      - targets:
          - 'http://WANIP:8080/devices'
    relabel_configs:
      - source_labels: [__address__]
        target_label: __param_target
      - source_labels: [__param_target]
        target_label: instance
      - target_label: __address__
        replacement: json-exporter:7979

Though for faster testing I'm running this inside the json-exporter container instead of waiting up to 60s for prometheus to query it. wget -O- "http://localhost:7979/probe?target=http://WANIP:8080/devices&module=test_module"

I've tried to reduce the json as much as possible using a flask script, as the original comes from a 3rd party API, to try and isolate the issue. Any idea is welcome!