Aliasing locales in Next.js

I'm using next-i18next to localize our Next.js app with the following config:

module.exports = {
  i18n: {
    defaultLocale: "en",
    locales: ["en", "zh-CN"],
  },
};

This works well. Agents with zh-CN among Allow-Language header are taken to the Simplified Chinese version of the page.

Is there a way to make zh-SG agents redirect to the Simplified Chinese version without creating a separate locale JSON file? Similarly, zh-HK and zh-TW will use the same translations (Traditional Chinese). I'm trying to avoid maintaining duplicate files by only having one file for Simplified and one for Traditional Chinese. Thank you!