How to put user id in registered claims

I am using asp.net core web api this is a piece of code, where i am using registered claims to add username and email in jwt token payload, now the question is. How can I send user id in registered claims like username and email. on line number 45 (if you see code image) (https://i.stack.imgur.com/qCm42.png)

if (userdata!=null)
            {
                var secretkey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes("secret key here");
                var signingCredentials = new SigningCredentials(secretkey, SecurityAlgorithms.HmacSha256);
                var claims = new[] {
                new Claim(JwtRegisteredClaimNames.Name,userdata.Username),
                new Claim(JwtRegisteredClaimNames.Email,userdata.Email),
                new Claim(JwtRegisteredClaimNames.,userdata.Id),
                };