culinary.kemonine.info/themes/hugo-theme-relearn/exampleSite/content/shortcodes/INCLUDE_ME.md

You can add standard markdown syntax:

• multiple paragraphs
• bullet point lists
• emphasized, bold and even bold emphasized text
• links
• etc.

...and even source code

the possibilities are endless (almost - including other shortcodes may or may not work) (almost - including other shortcodes may or may not work)