C#-Where to use log4net setting with azure function app?

Question

I'am working with azure functions,in order to log exception details to application insight from Azure functions, I was logging messages by using TelemetryClient() object along with instrumentation key like below

Example:

 var telemetryClient = new TelemetryClient();
 telemetryClient.InstrumentationKey = ConfigurationSettings.AppSettings["APPINSIGHTS_INSTRUMENTATIONKEY"];
 appInsights.TrackEvent(message);

So, Now I want to use Log4Net for logging messages to application insight by azure function.

Found here some information Log4Net with Application Insights

Where to do below setting in azure function in order to use log4net logs with applicable insight? As azure function app does not have web.config file.

Can I add custom config file and put below setting and use that?

  <configuration>
  <configSections>
       <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
  </configSections>
  <log4net>
    <root>
      <level value="ALL"/>
      <appender-ref ref="aiAppender"/>
    </root>
    <appender name="aiAppender" type="Microsoft.ApplicationInsights.Log4NetAppender.ApplicationInsightsAppender, Microsoft.ApplicationInsights.Log4NetAppender">
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%message%newline"/>
      </layout>
    </appender>
  </log4net>
<configuration>