This is an example of how to extend VS Code with some useful text manipulation tools. This extension works for all file types.
Common casing operations e.g. toUpper, ToLower, SwapCase, Reverse and more
HTML encoding and Decoding
Open up VS Code and hit F1 and type ext select Install Extension and type mdtools hit enter and reload window to enable.
Update a selection
The extension is activated for all file types, and you open up a menu of commands by pressing Alt+T. Multi selection is supported for all commands. If you select ASCII Art you will get a secondary menu where you can choose the font.