Colons separating key and value pairs enhance readability in my book, so KDL goes too far for me. Other options are JSON5 (https://json5.org/ https://json5.org

Colons separating key and value pairs enhance readability in my book, so KDL goes too far for me. Other options are JSON5 (https://json5.org/ https://json5.org/) and CUE (https://cuelang.org/docs/introduction/ https://cuelang.org/docs/introduction/). The latter is maximalist rather than minimalist, but very well thought out and worth checking out.