How to generate the Api Description .json file

[somanysteves]

This project looks pretty awesome, but what I'm really trying to do is generate c# clients. I know I can do that once I have the description.json file. And previously I was getting the file by using nswag with this aspnetcore2openapi when it was an asp.net core project. Now that I'm moving to azure functions I seem to be unable to replicate that functionality. Any help would be appreciated.

[RicoSuter]

I created an http endpoint trigger which generates it.