I personally don't think Lua is a good choice for an embedded language in 2024, the bare minimum should be indentation-based scopes and zero-indexed arrays. Of course, Tthis is your project, but perhaps taking an existing and mature language would ease the adoption?
For the configuration I'm planning something crazier, I might use my programming language that I built earlier (https://github.com/wongjiahau/kk).