One of the first tasks would be to remove the dependency to the Plugin_D3D which is no longer needed as CryENGINE V is now shipping full engine Sourcecode. So one of the first things would be to extend the CryENGINE V Renderer interface to reliably update/exchange the HTML rendering surface, once this is done the Plugin is ready for its release.
The plugin was already fully working on older CryENGINE versions see here: https://www.youtube.com/watch?v=YphBFbS93EU
This issue and project itself can be taken on by anyone with intermediate C++, DirectX and CryENGINE experience. Happy Coding ;)