Hi Kasper,

you can add a Dashboard to your custom section, to display the html.

in a package.manifest file (in a app_Plugins folder) this looks like :

{
  "javascript": [
    "~/App_Plugins/MySimpleApp/SimpleApp.Controller.js"
  ],
  "dashboards": [
    {
      "alias": "myDashboard",
      "sections": [ "mySection" ],
      "view": "~/App_Plugins/MySimpleApp/dashboard.html"
    }
  ]
}

you can also add a dashboard in code for example:

using Umbraco.Core;
using Umbraco.Core.Dashboards;

namespace MySampleApp
{
    public class MyDashboard : IDashboard
    {
        public string[] Sections => new string[] { "mySection" };

        public IAccessRule[] AccessRules
        {
            get
            {
                var rules = new IAccessRule[]
                {
                    new AccessRule {Type = AccessRuleType.Grant, Value = Constants.Security.AdminGroupAlias}
                };
                return rules;
            }
        }


        public string Alias => "MyDashoard";

        public string View => "~/App_Plugins/MySampleCode/MyDashboard.html";
    }

}

Just checked and the Dashboard Documentation for v8 is complete - so you can see more details here https://our.umbraco.com/documentation/Extending/Dashboards/