public class Accounts
{
    public string? AccountName { get; set; }
    public bool RecentContact { get; set; }
    public IEnumerable<Accounts> Tasks { get; set; }
    public List<Accounts> account = new();
}

public class Tasks
{
    public string? TaskName { get; set; } = "Example";
    public bool IsComplete { get; set; } = false;
    public List<Tasks> task = new();
}