I've tried your example of code to see how it works and don't get what the line with res.json(news) stands for?
Also while running this code with express "^4.18.1" i get promised failed on first error.

const comicsApi = require("comicbooks-api");
const express = require("express");
const app = express();

app.get("/", async (req, res) => {
  const comics = await comicsApi.getLatestComics(1);
  res.json();
});

app.listen(5050);

Create a publisher.md file

example :

1. Marvel Comics

• getMarvelComics

reference:
check all the publishers and their respective functions from test.js in __test__ folder