C#
services.AddControllers().AddJsonOptions(options =>
{
    options.JsonSerializerOptions.Converters.Add(new JsonPropertyNameEnumConverter(JsonNamingPolicy.CamelCase));
    options.JsonSerializerOptions.Converters.Add(new DoubleConvertor());
    options.JsonSerializerOptions.Converters.Add(new FloatConvertor());
    options.JsonSerializerOptions.PropertyNameCaseInsensitive = true;
});

C#
services.AddControllers().AddJsonOptions(options =>
{
    options.JsonSerializerOptions.Converters.Add(new JsonPropertyNameEnumConverter(JsonNamingPolicy.CamelCase));
    options.JsonSerializerOptions.Converters.Add(new DoubleConvertor());
    options.JsonSerializerOptions.Converters.Add(new FloatConvertor());
    options.JsonSerializerOptions.PropertyNameCaseInsensitive = true;
});