As a fun overview of the problem we're discussing, here's a rough list of the various mentioned languages in this comment section:

  - YAML
  - JSON
  - JSONC
  - XML
  - TOML
  - INI
  - CSV
  - NestedText
  - Starlark
  - Python
  - Dhall
  - Cue
  - Jsonnet
  - DADL
  - EDN
  - HCL