var serializeOptions = new JsonSerializerOptions
{
    WriteIndented = true,
    Converters =
    {
        new DateTimeOffsetJsonConverter()
    }
};

jsonString = JsonSerializer.Serialize(weatherForecast, serializeOptions);

var serializeOptions = new JsonSerializerOptions
{
    WriteIndented = true
};

serializeOptions.Converters.Add(DateTimeOffsetJsonConverter());
jsonString = JsonSerializer.Serialize(weatherForecast, serializeOptions);

var options = new JsonSerializerOptions
{
    Converters = { new JsonConverterFactoryForStackOfT() },
};

var options = new JsonSerializerOptions();
options.Converters.Add(new JsonConverterFactoryForStackOfT());

/// <summary>
/// Provides options to be used with <see cref="JsonSerializer"/>.
/// </summary>
public sealed partial class JsonSerializerOptions
{
    /// <summary>
    /// The list of custom converters.
    /// </summary>
    /// <remarks>
    /// Once serialization or deserialization occurs, the list cannot be modified.
    /// </remarks>
    public IList<JsonConverter> Converters => _converters ??= new(this);