[rohithgilla]

Apple tried something similar https://pkl-lang.org/

[lifthrasiir]

Pkl belongs to a related but different category of "configuration" languages, while we are talking about a pure serialization format. A serialization format can be used as a configuration language if designed carefully, but they are distinct.

[GeneThomas]

Xᴇɴᴏɴ excels at both.