// Somewhere in assembly
[assembly: AspMvcViewLocationFormat(@"~\Features\{1}\{0}.cshtml")]
[assembly: AspMvcViewLocationFormat(@"~\Features\Shared\{0}.cshtml")]

public class Startup
{
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddMvc(o => {
            o.Conventions.Add(new FeatureConvention());
        }).AddRazorOptions(o => {
            o.ViewLocationFormats.Clear();
            o.ViewLocationFormats.Add("/Features/{3}/{1}/{0}.cshtml");
            o.ViewLocationFormats.Add("/Features/{3}/{0}.cshtml");
            o.ViewLocationFormats.Add("/Features/Shared/{0}.cshtml");
            o.ViewLocationExpanders.Add(new FeatureViewLocationExpander());
        });
        // ...
    }
}

public class FeatureViewLocationExpander : IViewLocationExpander
{
    public void PopulateValues(ViewLocationExpanderContext context)
    {
    }

    public IEnumerable<string> ExpandViewLocations(ViewLocationExpanderContext context,
        IEnumerable<string> viewLocations)
    {
        if (context == null)
            throw new ArgumentNullException(nameof(context));
        if (viewLocations == null)
            throw new ArgumentNullException(nameof(viewLocations));
        if (context.ActionContext.ActionDescriptor is ControllerActionDescriptor descriptor
            && descriptor.Properties["feature"] is string feature) {
            foreach (var location in viewLocations) {
                yield return location.Replace("{3}", feature);
            }
        }
    }
}

public class FeatureConvention : IControllerModelConvention
{
    public void Apply(ControllerModel controller)
    {
        controller.Properties.Add("feature", GetFeatureName(controller.ControllerType));
    }

    private static string GetFeatureName(TypeInfo controllerType)
    {
        var tokens = controllerType.FullName.Split('.');
        if (tokens.All(t => t != "Features")) return "";
        var featureName = tokens
            .SkipWhile(t => !t.Equals("features",
                StringComparison.OrdinalIgnoreCase))
            .Skip(1)
            .Take(1)
            .FirstOrDefault();
        return featureName;
    }
}