I know this plugin is no longer supported and even though I tried a while ago to keep it going, the amount of effort required to build CEF was just ridiculous … I recommend you all look at this plugin: Web UI (HTML + JSON Interface) in Code Plugins - UE Marketplace
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The WebUI plugin allows developers to create rich web-based user interfaces using the Chromium Embedded Framework. It’s powered by the native UnrealCEFSubProcess built into UE4 and includes support for Windows, Mac, and Linux. This plugin also has a robust library that provides integrated management of objects, arrays, and primitive data types. It comes with an example project that demonstrates a startup map with a volume slider and FPS counter.
I have already integrated it in to my project and it works extremely well … the JavaScript callbacks are easy to use.