Sorry, still don’t have power. I need to deploy a rpgmaker game to MacOS to give you exact paths, but I see part of the problem. What you see as nwjs there is actually a folder named nwjs.app. You will need to put the www/package.json file inside that folder, but without being able to see a reference right now, I can’t tell you where.
Edit:
To clarify, there was an ice storm here. The power lines to my shop are lying on the ground right now. I can’t run my desktop or do any development right now.