Fetch API Docs using Docstrings inside APIs in Swagger

I need to create Docs for APIs and want to write the description and other details about API inside/near API only in the form of comments or Docstrings.

Till now I have explored that we can create APIs docs by writing API details in swagger.yaml file.

Please tell if this is possible or not using Swagger or I need to use something else.

Please Help.  

PS- The things which we write in yaml file should be fetched from APIs docstring.