How can I show code while documenting an API using Flasgger

Question

I'm documenting an API and I'd like to show some code examples in order to show how does my api works, I'm using Flasgger and I didn't find any information about this topic, I read from x-codeSamples doc to show pieces of code by writing something like this but it's not working for me

  x-code-samples:
        lang: JavaScript
        source: console.log('Hello World');

so, how can I show pieces of code using flasgger?