Really would like to try this when you figure it out. What I want to run is a GeForce Now, Luna and xCloud, but it probably would need something to manipulate browser's user-agent, as they require specific browsers.
Started digging to do it myself. Greenlight uses Electron for building the windows, so Chromium based. But nx.js uses QuickJS engine to run the scripts, not exactly the same thing. One is emulating a browser (or some of it) and the other is...
btw i feel this a good time to remind you guys that sea of thieves was made by rare, who also made DKC1-3 and DK64, alongside banjo kazooie and conker's bad fur day