[feature] Json schema support for defaults yaml

[Freed-Wu]

Describe your proposed improvement and the problem it solves.

pandoc has a usage as following:

defaults.yaml:

---
to: beamer
pdf-engine: xelatex

pandoc -ddefaults.yaml -oXXX.pdf XXX.md

Can defaults.yaml have a json schema and been published in schemastore? Like alacritty?

This is a reference about latexindent.yaml cmhughes/latexindent.pl#206

The steps are following:

• Create a json schema
• Add its URL to schemastore.

[perrotuerto]

Hi! As I commented in #11117, I would like to see a JSON Schema for Pandoc JSON AST. I read #10996 and I am under the impression that the ideal JSON Schema would be produced from the code instead of being done and maintained manually. Is that right?

If not, would it be a good idea to at least make a draft from the module pandoc documentation?

[jgm]

This issue appears to be for the defaults.yaml format, rather than the AST. Could open a new issue for the AST.