private T GetAA<T>(JsonTypeInfo<T> jTypeInfo)
{
    string json = "{\"Data\": {\"Name\":\"World\", \"Id\":2 }}";
    Utf8JsonReader reader = new(Encoding.UTF8.GetBytes(json));
    reader.Read();
    reader.Read();

    var propertyName = reader.GetString();
    if (propertyName != nameof(ModelA.Data))
        throw new Exception("Invalid property name");

    reader.Read();

    var data = JsonSerializer.Deserialize<T>(ref reader, jTypeInfo);

    return data;
}

private T GetAA<T>(JsonTypeInfo<T> jTypeInfo)
{
    string json = "{\"Data\": {\"Name\":\"World\", \"Id\":2 }}";
    Utf8JsonReader reader = new(Encoding.UTF8.GetBytes(json));
    reader.Read();
    reader.Read();

    var propertyName = reader.GetString();
    if (propertyName != nameof(ModelA.Data))
        throw new Exception("Invalid property name");

    reader.Read();

    var data = JsonSerializer.Deserialize<T>(ref reader, jTypeInfo);

    return data;
}

private T GetB<T>(JsonTypeInfo<T> jTypeInfo)
{
    string json = "{\"Data\": {\"Name\":\"World\", \"Id\":2 }}";
    JsonElement r = JsonSerializer.Deserialize(json, LibJsonContext.Default.ModelBT)!.Data;
    return SerializeUserModel<T>(r, jTypeInfo)!;
}

private T SerializeUserModel<T>(JsonElement jElement, JsonTypeInfo<T> jTypeInfo)
{
    return jElement.Deserialize<T>(jTypeInfo)!;
}

private T GetB<T>(JsonTypeInfo<T> jTypeInfo)
{
    string json = "{\"Data\": {\"Name\":\"World\", \"Id\":2 }}";
    JsonElement r = JsonSerializer.Deserialize(json, LibJsonContext.Default.ModelBT)!.Data;
    return SerializeUserModel<T>(r, jTypeInfo)!;
}

private T SerializeUserModel<T>(JsonElement jElement, JsonTypeInfo<T> jTypeInfo)
{
    return jElement.Deserialize<T>(jTypeInfo)!;
}

using VARTYPE = System.Runtime.InteropServices.VarEnum;
///...
[StructLayout(LayoutKind.Explicit, Pack = 8)]
public struct PROPVARIANT
{
    /// <summary>Value type tag.</summary>
    [FieldOffset(0)] public VARTYPE vt;

    /// <summary>Reserved for future use.</summary>
    [FieldOffset(2)] public ushort wReserved1;

    /// <summary>Reserved for future use.</summary>
    [FieldOffset(4)] public ushort wReserved2;

    /// <summary>Reserved for future use.</summary>
    [FieldOffset(6)] public ushort wReserved3;

    /// <summary>The decimal value when VT_DECIMAL.</summary>
    [FieldOffset(0)] internal decimal _decimal;

    /// <summary>The raw data pointer.</summary>
    [FieldOffset(8)] internal IntPtr _ptr;

    /// <summary>The FILETIME when VT_FILETIME.</summary>
    [FieldOffset(8)] internal System.Runtime.InteropServices.ComTypes.FILETIME _ft;

    /// <summary>The BLOB when VT_BLOB</summary>
    [FieldOffset(8)] internal Vanara.PInvoke.Ole32.BLOB _blob;

    /// <summary>The value when a numeric value less than 8 bytes.</summary>
    [FieldOffset(8)] internal ulong _ulong;

    /// <summary>Initializes a new instance of the <see cref="PROPVARIANT"/> class as VT_EMPTY.</summary>
    public PROPVARIANT()
    {

    }
    public PROPVARIANT(string value)
    {
        ArgumentNullException.ThrowIfNull(value);
        vt = VarEnum.VT_LPWSTR;
        _ptr = Marshal.StringToCoTaskMemUni(value);
    }

    public VarEnum VarType { get => (VarEnum)vt; set => vt = (VARTYPE)value; }
}

using VARTYPE = System.Runtime.InteropServices.VarEnum;
///...
[StructLayout(LayoutKind.Explicit, Pack = 8)]
public struct PROPVARIANT
{
    /// <summary>Value type tag.</summary>
    [FieldOffset(0)] public VARTYPE vt;

    /// <summary>Reserved for future use.</summary>
    [FieldOffset(2)] public ushort wReserved1;

    /// <summary>Reserved for future use.</summary>
    [FieldOffset(4)] public ushort wReserved2;

    /// <summary>Reserved for future use.</summary>
    [FieldOffset(6)] public ushort wReserved3;

    /// <summary>The decimal value when VT_DECIMAL.</summary>
    [FieldOffset(0)] internal decimal _decimal;

    /// <summary>The raw data pointer.</summary>
    [FieldOffset(8)] internal IntPtr _ptr;

    /// <summary>The FILETIME when VT_FILETIME.</summary>
    [FieldOffset(8)] internal System.Runtime.InteropServices.ComTypes.FILETIME _ft;

    /// <summary>The BLOB when VT_BLOB</summary>
    [FieldOffset(8)] internal Vanara.PInvoke.Ole32.BLOB _blob;

    /// <summary>The value when a numeric value less than 8 bytes.</summary>
    [FieldOffset(8)] internal ulong _ulong;

    /// <summary>Initializes a new instance of the <see cref="PROPVARIANT"/> class as VT_EMPTY.</summary>
    public PROPVARIANT()
    {

    }
    public PROPVARIANT(string value)
    {
        ArgumentNullException.ThrowIfNull(value);
        vt = VarEnum.VT_LPWSTR;
        _ptr = Marshal.StringToCoTaskMemUni(value);
    }

    public VarEnum VarType { get => (VarEnum)vt; set => vt = (VARTYPE)value; }
}