ASP.NET Core 7 configuration get section bind method does not work with double underscore values

Question

I am trying to read configuration values from my appSettings.json and bind them to an object. However, I am unable to get values when the environment variables hierarchy is mentioned using double underscores (__). It works when the environment variables are mentioned in JSON hierarchy.

builder.Configuration.GetSection("Serilog").GetChildren() 

returns count = 0 with double underscore. It returns count 2 when appSettings are in json format.

Any thoughts on how to get this working with the double underscore as my docker containers are having these variables as environment variables.