Here is a solution that doesn't require any change in the way you use the Json serializer. In fact, it should also work with other serializers. It uses the cool DynamicObject class.

The usage is just like you wanted:

var usersPagedData = new PagedData<User>("Users");
....

public class PagedData<T> : DynamicObject
{
    private string _name;

    public PagedData(string name)
    {
        if (name == null)
            throw new ArgumentNullException(nameof(name));

        _name = name;
    }

    public IEnumerable<T> Data { get; private set; }
    public int Count { get; private set; }
    public int CurrentPage { get; private set; }
    public int Offset { get; private set; }
    public int RowsPerPage { get; private set; }
    public int? PreviousPage { get; private set; }
    public int? NextPage { get; private set; }

    public override IEnumerable<string> GetDynamicMemberNames()
    {
        yield return _name;
        foreach (var prop in GetType().GetProperties().Where(p => p.CanRead && p.GetIndexParameters().Length == 0 && p.Name != nameof(Data)))
        {
            yield return prop.Name;
        }
    }

    public override bool TryGetMember(GetMemberBinder binder, out object result)
    {
        if (binder.Name == _name)
        {
            result = Data;
            return true;
        }

        return base.TryGetMember(binder, out result);
    }
}