Language toggle in front matter

[shawnthompson]

First off this project is so awesome thanks for bringing back to life.

This is a mix of Q&A or idea if it's not possible already.

When using the i18n Support, is it possible to capture the slug that is created for the post in the other language front matter to be able to use it as a toggle link on the page.

Basically, I'm using 11ty to build my English and French site so if I create a post called "My awesome blog post" in English, which creates my-awesome-blog-post.md and "Mon super article de blog" in French, which created mon-super-article-de-blog.md.

I'd like the pages to have the following in their front matter:

my-awesome-blog-post.md

---
title: My awesome blog post
frSlug: mon-super-article-de-blog (created by Decap)
---

mon-super-article-de-blog.md

---
title: Mon super article de blog
enSlug: my-awesome-blog-post (created by Decap)
---

Then in my 11ty layout for the my-awesome-blog-post/index.html page, I could add <a lang="fr" hreflang="fr" href="{{ frSlug }}">Version française</a>on the page.

This would be a nice to have field to add in the config.yml file.