UCG - Data notation

UCG, aka Universal Configuration Grammar, is a data notation created in 2017 by Jeremy Wall.

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UCG is a universal grammar for configuration. UCG's goal is not to define a configuration format like JSON, YAML, or TOML. It is not intended to replace the other serialization formats. Instead it is intended to provide a common grammar for generating those formats.

UCG website
UCG is developed on GitHub and has 27 stars
file extensions for UCG include ucg
UCG compiles to JSON or YAML or TOML or XML
UCG is written in Rust
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Example from the web:

let db_confs = import "db/mysql/hosts.ucg";
let consul_hosts = import "services/consul/hosts.ucg".host_pool;

let conf = {
    port = 8888,
    addr = "0.0.0.0",
    db = {
        host = db_confs.host_pool.addr,
        port = db_confs.host_pool.port,
        database = "myservicedb",
    },
    config_svc = consul_hosts.url,
};

out json conf;