title: JsonConverter equivalent in using System.Text.Json
body: <p>I'm starting to migrate some code I have from <code>Newtonsoft.Json</code> to <code>System.Text.Json</code> in a .net Core 3.0 app. </p>
  
  <p>I migrated the properties from </p>
  
  <p><code>[JsonProperty("id")]</code> to <code>[JsonPropertyName("id")]</code></p>
  
  <p>but I have some properties decorated with the <code>JsonConverter</code> attribute as:</p>
  
  <p><code>[JsonConverter(typeof(DateTimeConverter))]
   [JsonPropertyName("birth_date")]
   DateTime BirthDate{ get; set; }</code></p>
  
  <p>But I cannot find the equivalent of this Newtonsoft converter in <code>System.Text.Json</code> Does someone know how can this be achieved in .net Core 3.0?</p>
  
  <p>Thanks!</p>