Access Web.config settings in Asp.Net Core App?

I understand that core has a new configuration system that is quite flexible and that’s great. But there are things I like about the web.config based configuration system from .net 4.x. For example one can put comments in the web.config file since it’s an xml file. And that for me is worth sticking with xml rather than going with the shiny new json approach. [Update: I now understand that the json approach also supports comments in the file.]