add possible solution for later

feat/ScriptInjectionStartupFilter.cs

@@ -0,0 +1,21 @@
+using System;
+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Hosting;
+
+namespace Jellyfin.Plugin.Seasonals;
+
+/// <summary>
+/// Startup filter to register the ScriptInjectionMiddleware.
+/// </summary>
+public class ScriptInjectionStartupFilter : IStartupFilter
+{
+    /// <inheritdoc />
+    public Action<IApplicationBuilder> Configure(Action<IApplicationBuilder> next)
+    {
+        return builder =>
+        {
+            builder.UseMiddleware<ScriptInjectionMiddleware>();
+            next(builder);
+        };
+    }
+}