Apples AutoLayout already does this — and in a much more elegant way. I’ve been making MacCatalyst apps recently and have been searching hide and wide for a 1:1 UIKit/AutoLayout <> Web front end (aka a rats nest of js, css and html).
I would argue AutoLayout has a way easier job: There are less backward-compatibility concerns, everyone is using the same GUI-based editor and there are many less device configurations to account for. It is also arguably less flexible than the Web in terms of the range of UIs that you could create.
