Adding timestamp to kaaiot

Using Arduino Project Guidance
1

I'm struggling sending the data with timestamp, I've pressed on auto-extraction and changed the format to sec-unix-epoch but I didn't specify a path (I'm not sure what I should write there)

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Here is the json I've tried to send


DynamicJsonDocument telemetry(128);
    telemetry.createNestedObject();
    unsigned long timestamp = strtoul("1630992996",NULL,10); //1630992996 = Tuesday, September 7, 2021 5:36:36 AM just for test
    Serial.print("timestamp = ");
    Serial.println(timestamp);
    telemetry[0]["temperature"] = random(18, 23);
    telemetry[0]["timestamp"] =  timestamp;
    //Sending data to the Cloud
    String payload = telemetry.as<String>();
    mqttClient.beginMessage(metricsPublishTopic);
    mqttClient.print(payload.c_str());
    mqttClient.endMessage();
    
    Serial.println("Published on topic: " + metricsPublishTopic);
    Serial.println("payload:  " + payload);

Should I add a path to the json payload? If yes, how? Do you have examples for such problems?

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