Nah, not likely.
Sketchfab is all about art, it’s in the title.
Epic has been focused on streaming and lightweight viewers of UE4 scenes; they have shown no interest in HTML5 as a platform other than what I just mentioned.
They have removed support for HTML5 from 4.24+ and even removed 32bit support from UE5 (making it incompatible with HTML5 for at least a year or until wasm64 is a thing).
Our studio however is working on extended HTML5 support and has 4.25, 4.26 and 4.27 support with UE5 incoming.