Ctrl+P
This is the VS Code extention that adds {ruby|ルビ} syntax support to built-in markdown preview. This extension is built on markdown-it-ruby.
{漢字|かんじ}
<ruby>漢字<rt>かんじ</rt></ruby>
{漢字|かん|じ}
<ruby>漢<rt>かん</rt>字<rt>じ</rt></ruby>