Question please. Rtl_433 Inkbird Sensor and yaml config

Hello all, This is my input from my Inkbird Pool sensor. I did create a sensor and seen the info on the Overview page. But I just need the temp in a box.

{“time”:“2021-02-10 03:34:56”,“model”:“Inkbird ITH-20R”,“id”:18020,“battery”:89,“sensor_num”:8,“mic”:“CRC”,“temperature_F”:68.72,“temperature2_F”:5422.81982,“humidity”:0.1}

I have

mqtt:
sensor:

  • platform: mqtt
    state_topic: rtl_433/Inkbird
    name: temperature_C
    unique_id: 18020
    unit_of_measurement: F
    value_template: >
    {% if value_json is defined and value_json.id == 18020 %}
    {{ ((value_json.temperature_C * 1.8) + 32)|round(1) }}
    {% else %}
    {{ states(‘sensor.outdoor_temp’) }}
    {% endif %}

Thanks in advance.