aspnetcore/test/WebSites/InlineConstraintsWebSite/App_Data/config.json

{
    "TemplateCollection" : {
        "areaRoute" : {
            "TemplateValue" : "{area:exists}/{controller=Home}/{action=Index}"
        }, 
        "actionRoute" : {
            "TemplateValue" : "{controller=Home}/{action=Index}"
        }
    }
}