How to add userid to payload when generate access token using JWT ASP.NET core 2.2 ?

public string GenerateTokens(string userId)
        {

            var Claims = new Claim[]
                     {
            new Claim(JwtRegisteredClaimNames.Sub,userId)
                     };
            var signingkey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes("this is secret phrase"));
            var SigningCredntials = new SigningCredentials();
            var Jwt = new JwtSecurityToken();
            
            return new JwtSecurityTokenHandler().WriteToken(Jwt);
        }
configure service on startup
public void ConfigureServices(IServiceCollection services)
        {
            
            //=================This Setting Related To generate Access Token Data===============
            var signingkey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes("this is secret phrase"));
           
            services.AddAuthentication(options => {
                options.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
                options.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;

            }).AddJwtBearer(cfg =>
            {
                cfg.RequireHttpsMetadata = false;
                cfg.SaveToken = false;
                cfg.TokenValidationParameters = new Microsoft.IdentityModel.Tokens.TokenValidationParameters()
                {
                    IssuerSigningKey = signingkey,
                    ValidateAudience = false,
                    ValidateIssuer = false,
                    ValidateLifetime = false,
                    ValidateIssuerSigningKey = true
                };
            });
         
            services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);
           
        }