xamarinios 
namespace System.Text.Json.Nodes
{
    [DebuggerDisplay("JsonArray[{List.Count}]")]
    [DebuggerTypeProxy(typeof(DebugView))]
    public sealed class JsonArray : JsonNode, ICollection<JsonNode?>, IEnumerable<JsonNode?>, IList<JsonNode?>, IEnumerable
    {
        public int Count { get; }
    }
}
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.NET 5.06.07.08.09.010.0
.NET Core 2.02.12.23.03.1
.NET Framework 4.6.14.6.24.74.7.14.7.24.84.8.1
.NET Standard 2.02.1
Information specific to xamarinios
Assemblies

System.Text.Json , Version=10.0.0.0, PublicKeyToken=cc7b13ffcd2ddd51

System.Text.Json , Version=9.0.0.0, PublicKeyToken=cc7b13ffcd2ddd51

Referencing

Your project needs a package reference to System.Text.Json.

Package System.Text.Json (10.0.0-preview.1.25080.5) netstandard2.0
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This framework does not have platform annotations.

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