JWT Authentication in a distributed scenario with .NET 5 - .net-core

Question

I'm trying to implement JWT authentication in a .NET 5 WebAPI. Everything works fine until I add more web servers to the application.
How could I store JWT, for example, in a SQL Server database instead of having them in memory on the single server?
Here's the implementation working on a single server:
Startup
services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme).AddJwtBearer(options =>
{
options.SaveToken = true;
options.TokenValidationParameters = new TokenValidationParameters
{
ValidateIssuer = true,
ValidateAudience = true,
ValidateIssuerSigningKey = true,
ValidIssuer = Context.JwtIssuer,
ValidAudience = Context.JwtIssuer,
IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(Context.JwtSecretKey))
};
}
Controller
[HttpGet("Login")]
public IActionResult Login(string uid, string password)
{
var hash = _userManager.GetPasswordHash(uid);
if (string.IsNullOrEmpty(hash))
{
return NotFound("Account not found");
}
if (!_passwordHasher.Check(hash, password))
{
return Unauthorized("Uid/password not correct");
}
var authSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(Context.JwtSecretKey));
var token = new JwtSecurityToken(
issuer: Context.JwtIssuer,
audience: Context.JwtIssuer,
expires: DateTime.Now.AddHours(3),
claims: new List<Claim>() { new Claim(ClaimTypes.Name, uid)},
signingCredentials: new SigningCredentials(authSigningKey, SecurityAlgorithms.HmacSha256)
);
return Ok(new
{
token = new JwtSecurityTokenHandler().WriteToken(token),
expiration = token.ValidTo
});
}