Support for Custom Syntax Highlighers

Describe your feature request
There are requests to support syntax highlighting for different languages, libraries, or frameworks. This could be handled easily by supporting one of the existing syntax highlighting formats.

What problem(s) would this feature solve?
Make text more easily readable.

Explain what you were trying to do when you came across the problem leading to this feature request
I am trying out a newer reactive JavaScript library called Arrow.js that uses string templates to parse HTML instead of something like React with the jsx. I know that a syntax highlighter exists but there is no way to add it to the editor.

This will be solved if this extention is made Custom syntax highlighting