Yaml
No Change
adopt
YAML is a more human readable format which is fully API compatible with JSON. It gained popularity as being the Declarative IaC language for things like Docker Compose, and Kubernetes.
There are some syntactic sugar like anchors and aliases and deep merging of maps which makes it easier to for humans to read. Additionally, many systems (like Helm) add a templating language on-top to make generating large amounts of YAML easier. And since Yaml is a subset of JSON Schema that can be used to validate complex YAML. Because of this ubiquity you should adopt it.
The creators of YAML also created YamlScript as a templating language, but it is not wide spread yet.