How to create a perfect Sekeleton component

Existing solutions are either over-engineered and require measuring DOM elements either in runtime or in build time using Playwright or similar tools or, quite contrary, over-simplified, which results in a lot of manual work to adjust the placeholder sizes to match the existing blocks. I'd like to give a talk about completely different solution to the problem, that stands somewhere in between: it's quite simple in implementation, did 80% of work on its own and just require some adjustments once in a while.