Since Mana is not monospaced, and doesn’t have the basic characters you need (ie ASCII), it will be difficult to write code in VS-Code, which I think only lets you select one font. The terminal can output the glyphs if you select the font:
but it’s not something that’s very usable.
You could investigate using Pluto or BonitoBook - being HTML-based, they might allow you to display output in different fonts. I haven’t tried it though.
Of course you can probably display them with any package that provides a drawing canvas and lets you choose fonts, such as plotting packages.