Adding a widget that will automatically generate URL when new post is created

[mohammedasker]

Hello. I originally asked this question on Decap CMS, however, no one seems to respond to it. So I'm hoping anyone with more knowledge can help me out figuring the problem.

Alright, so I have a job board website that is built with Eleventy (11ty) and Decap CMS. I want to add a widget that will automatically generate the URL of posts I created from Decap CMS. The reason why I want it is so that every time I create new job posts, it will automatically add a URL in the markdown front matter. I need these URLs so that they will show up in Google Rich Results and improve the SEO of my website.

collections:
  - name: "blog"
    label: "Blog"
    folder: "src/blogs"
    create: true
    slug: "{{year}}-{{month}}-{{day}}-{{slug}}"
    fields:
    - { label: "Title", name: "title", widget: "string" }
    - { label: "Body", name: "body", widget: "markdown" }
    - { label: "Post URL", name: "posturl", widget: "slug" } <--- something like that

---
title: Sample post
posturl: https://www.example.com/blogs/2024-04-16-sample-post/ <--- creates url in markdown frontmatter
---

I don't see any examples in the Decap CMS documentation, so I was wondering if it is possible to do it.