Hello, I made a post about this too and with suggestions for improvements, I consider Markdown support essential and fundamental and it is something relatively simple to add, it can start little by little with less resources, but it is important to have at least one parser added, it even has several in Ruby ready and good>
Here’s the post I made about it:
I favor Markdown over direct HTML, including Documentation, Knowledge Base, Blog, Ticket, Email and other use cases, due to standardization and ease of use.
I recommend Monaco as a base editor because it is rich in features and easier to add new features: Monaco Editor
"The Monaco Editor is the code editor that powers VS Code. A good page describing the code editor’s features is here. It is licensed under the MIT License and supports Edge, Chrome, Firefox, Safari and Opera. The Monaco editor is not supported in mobile browsers or mobile web frameworks.Find more information at the Monaco Editor repo.
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It can be used with Preview, Fixed Toc, Snippets and other features, we even did that and we can release our Monaco with new features if you want to use it in Zammad or another idea is to use some simple JS, the most important being that you can see the code mode /Markdown or even ideal to have no visual mode.
This forum even has a beautiful Markdown editor with very interesting features.