Is there a way to automatically include content files into asp.net project file?

I’m frequently adding a lot of content files (mostly images and js) to my ASP.NET project. I’m using VS publish system, and on publish, new files are not published until I include them in the project. I would like to auto include all files in specified directory. Is there a way to specify which directories should be auto-included in csproj file or anywhere else?

Can the new csproj file structure be used with a ASP.NET Framework project?

The new .csproj format includes some significant improvements over the classic files, including tight integration with NuGet package management and significantly less-verbose structure. I want to gain these benefits whilst still using the .NET Framework 4.6 and ASP.NET (because my project depends on Umbraco which has yet to produce a .NET Core version).