Not from the official source, but we (Wonder Interactive Inc.) have a custom version of the engine that compiles to wasm. We are looking to upstream to Epic, or at least have a plugin that doesn't require custom source.
IIUC the reason HTML5 was dropped in the first place was for the big render re-work that went on during 4.27 + 5.0. So now seems like a good time to add modern WebGPU support back.
Do have to ask, isn't your business model for "theimmersiveweb" built around this WebGPU capability? Providing that tech to others or making your site a marketplace for web games?
What's the benefit to your company in this relationship?