Export from Notes.app to Markdown format? Using notes is handy as you can have it in multiple devices and makes transition almost effortless. I'm willing to move some of these to Markdown so I can share the content and add formatting to it. 

Is it possible to be done by default? The only export option is to PDF. If there is some hack that I can apply I'm happy to spend some cycles on that but maybe there is already an option I'm missing.

I've find a few questions pointing to apps to directly do this (Editor or notes application with Markdown support?), but I'm trying to find an alternative with the native app.
Unfortunately the native app does not offer this. 

There is an app available for macOS in the App Store called Exporter that offers this. I am not affiliated with the software.

Another option is exporting to PDF in Notes, (File > Export as PDF…), then exporting to Markdown using a website like this one: PDF To Markdown Converter