title: azure application settings - how to add nested item
body: <p>i have a appservice on azure that is running a .net core api.</p>
  
  <p>in my appsettings.json file i have a section something similar to :</p>
  
  <pre><code>"Serilog": {    
  "LevelSwitches": { "$controlSwitch": "Information" },
  "MinimumLevel": {
    "ControlledBy": "$controlSwitch",
    "Override": {
      "Microsoft": "Warning",
      "System": "Warning"
    }
  },
  "WriteTo": [
    {
      "Name": "File",
      "Args": {
        "path": "LOGS\\log.json",
        "rollingInterval": "Day",
        "formatter": "Serilog.Formatting.Json.JsonFormatter, Serilog"
      }
    },      
    {
      "Name": "Seq",
      "Args": {
        "serverUrl": "https://MyLoggingServer",
        "apiKey": "AAAAAAAAAAAAAAAAA",
        "controlLevelSwitch": "$controlSwitch"          
      }
    }
  ]}
  </code></pre>
  
  <p>In azure appsetting section on the azure portal i'm not sure how i would go about setting the apiKey, in other more simple settings i have another section in appsettings.json</p>
  
  <pre><code> "CustomSettings": {    
      "MySpecificSetting": "ABCDEFG",    
    }
  </code></pre>
  
  <p>Then in azure portal i have been able to set the setting by doing the following</p>
  
  <pre><code>CustomSettings:MySpecificSetting 
  </code></pre>
  
  <p>but i'm not sure how this syntax would allow me to access the specific item in the writeTo array</p>
  
  <p>Thanks for any help</p>