The latest release adds a 'Bundle assets' option for the Windows WebView2, macOS WKWebView and Linux CEF export options. This will combine all the exported files in the www subfolder into a single file named assets.dat, meaning it is no longer possible to casually browse the exported files in the install folder. The file is not encrypted, but it should do the job of preventing anyone easily finding the files.
It's pretty similar to package.nw in NW.js (being a non-encrypted bundle file), but it has the additional advantage of having much better performance. With NW.js package.nw was just a zip file, and NW.js would fully extract it to a temporary folder on startup, which could be too slow to be usable for large projects. With our new export options using assets.dat it does not need to extract anything and can directly read data from that file, so there is no impact to startup time even for very large projects. Also as assets.dat is not a zip file, you can't use the old trick of renaming package.nw to pckage.zip to get at the files, so arguably it's better protected too. So overall I'd say the new export options handle this much better now than NW.js ever did.