Unable to add plugin to Altair through Settings property

[nekosaur]

I am trying to add a plugin to Altair, using the following code

app.UseGraphQLAltair("/ui/altair", new AltairOptions
{
  Settings = new Dictionary<string, object?>()
  {
    { "plugin.list", new[] { "foobar" } }
  }
});

But I get the following error

NotSupportedException: JsonTypeInfo metadata for type 'System.String[]' was not provided by TypeInfoResolver of type 'Platform.Web.Altair.SourceGenerationContext'. If using source generation, ensure that all root types passed to the serializer have been annotated with 'JsonSerializableAttribute', along with any types that might be serialized polymorphically.