YamlDotNet.System.Text.Json — nugetz

// to serialize a object to yaml
var yaml = YamlConverter.Serialize(someObject);

// to serialize json to yaml
var yaml = YamlConverter.SerializeJson(someJson);

// to load your object as a typed object
var obj = YamlConverter.Deserialize<MyTypedObject>(yaml);

using YamlDotNet.Serialization;
using YamlDotNet.System.Text.Json;

var serializer = new SerializerBuilder()
            .AddSystemTextJson()
            .Build();

var yaml = serializer.Serialize(obj);

var deserializer = new DeserializerBuilder()
            .AddSystemTextJson()
            .Build();

var myObject = deserializer.Deserialize<MyType>(yaml)