I rarely make feature requests, but i recently became aware of an experimental feature in Chromium named HTML-in-Canvas. Basically, it lets you draw HTML content into canvas elements, and do literally whatever you want with them. Of course, GDevelop also uses a canvas to render. And so once this escapes being an experimental feature, will this finally be added so test inputs, iframes, etc, will finally be able to be composited as objects rather than overlayed HTML elements?
If you use Chrome, here is a great website for visualizing some of these features and how they can be used.