There isn't a way to add it right now, however espruino.com/ide is a PWA which means it's a website which (once loaded once) will work offline.
I think the emulator is included in that so you probably don't need the Chrome app now
@Gordon started
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
There isn't a way to add it right now, however espruino.com/ide is a PWA which means it's a website which (once loaded once) will work offline.
I think the emulator is included in that so you probably don't need the Chrome app now