I am building a WASM based "grid editor". It's really just a way to build a UI for anything (desktop, mobile, web) by slicing up a grid and putting content in it. Then you can export the grid in an extremely portable format that can be reas anywhere (no, not json, even simpler) and use that grid data to implement your UI. The grid data contains the content or references to content which you can just apply on render.

visualgrideditor.app

Mad with Odin, compiled to WASM, vanilla JS and has Laravel integration. I just need to alpha test this more and see if there's anybody who wants to use it.