I am using app.config appsetting to write configuration. How will we use Header in file sink using app.config

Question

Using code i am able to add header in file log:

WriteTo.File("logheadertest123.dll",
    hooks: new Serilog.Sinks.File.Header.HeaderWriter(headerFactory))

We should be able to Add Header in Files using app.config

How can i achieve this in app.config?