I made a thing. I've created a shortcode for @eleven_ty so I can use Cloudinary images within markdown files. This is something I discovered I needed while using Forestry.io and markdown files.
With a bit of help from @FrankTldr at Forestry in identifying the solution, I set off and created it.
https://github.com/juanfernandes/eleventy-plugin-cloudinary
<img src="https://res.cloudinary.com/juanfernandes/q_auto,f_auto/imagename.jpg" alt="Image alt text">