It's something I've looked into in the past, and I believe the short answer was : nope !

But there's a long answer.

There's already an implementation of WebView in qmlweb (use import QtWebView 1.0). It uses an iframe to provide a result similar to the native WebView... but some features are unavailable: history, loading html directly into the iframe, managing cookies...

These are things that we just can't do reliably with iframes, mostly because of the default CORS setup, which will prevent you from running JavaScript within an iframe... which you'd definitely need to do stuff like injecting HTML, managing the history, etc.

If you're interested in this topic, the following discussion on stackoverflow will give you all the details you need:
https://stackoverflow.com/questions/251420/invoking-javascript-code-in-an-iframe-from-the-parent-page

Basically, and if memory serves well : assuming you use the WebView to display a page that's hosted on a server that you own, then you could configure it to allow your QMLWeb application to run JavaScript inside the iframe. An implementation of WebView within QMLWeb could work on these conditions.

Here's the current implementation for WebView:
https://github.com/qmlweb/qmlweb/blob/master/src/modules/QtWebView/WebView.js

The same argument can be made for WebEngine... there's probably a whole bunch of stuff in WebEngine that just cannot be done through JavaScript code that would run from within a browser.

Anyhow, if you're interested in trying to provide a better WebView implementation, I can provide some guidance... but I'm a bit too busy at the moment to tackle this right now.

Is Possible To Add WebView or WebEngine To QmlWeb? #460

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