Due to the large volume of questions and comments concerning the Engine, we did not have a to respond to your post at the time you submitted it. However, if you are still interested, the following is our documentation on HTML5 in UE4: [HTML5 Game Development][1]
While I do not see any documentation providing this specific information, please check out [this link][2].
Thanks!
Sharing and Releasing Projects for Unreal Engine | Unreal Engine 5.1 Documentation
[2]: http://