I got it working... Here's some tips for anyone else

1. run these step in console from wwwroot folder -> https://jsreport.net/on-prem
2. put process.json in wwwroot:

{
      "name"        : "worker",
      "script"      : "./server.js",
      "instances"   : 1,
      "merge_logs"  : true,
      "log_date_format" : "YYYY-MM-DD HH:mm Z",
      "watch": true,
      "watch_options": {
        "followSymlinks": true,
        "usePolling"   : true,
        "interval"    : 5
      }
    }

3. put web.config file in wwwroot:

<configuration>
    <system.webServer>
        <handlers>
            <add name="iisnode" path="server.js" verb="*" modules="iisnode" />
        </handlers>
        <rewrite>
            <rules>
                <rule name="DynamicContent">
                    <match url="/*" />
                    <action type="Rewrite" url="server.js"/>
                </rule>
            </rules>
        </rewrite>
    </system.webServer>
</configuration>```

What are the steps please to run this inside an Azure App service if I do not want to use docker? I'm interested in running jsreport in an Azure windows app service.

Thanks

Josh