MQTT sensor with special chars ("[")?

Hi,

I am trying to add a MQTT based sensor through configuration file as follows:

   -sensor:
        - state_topic: hzg/status
          name: "ow_t_out"
          unique_id: hzgowtout.mqtt
          unit_of_measurement: "°C"
          device_class: "temperature"
          force_update: true
          value_template: '{{value_json.onewire.t_out[0]}}'

When using MQTT explorer the message in MQTT looks like this (sorry only screenshot):

When checking on the dashboard the sensor says “Unknown”.

I somehow guess it is because of the brackets (‘[’ and ‘]’), am I right?

How can I enter the sensor in the .yaml file so it gets recognized properly?

Thanks!

/KNEBB

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