Adding Multiple MongoDb Collections in app.seeting file and how can they be called and used from service class

Question

I having multiple collections such as one for users, courses, action plans and diseases how can i add them in appsettings.json and how to call them separately in service class when utilizing them

appsetting.json file

{
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft": "Warning",
      "Microsoft.Hosting.Lifetime": "Information"
    }
  },
  "AllowedHosts": "*",
  "DatabaseSettings": {
    "ConnectionString": "mongodb://localhost:27017",
    "DatabaseName": "local",
    "CollectionName": "startup_log"
  }
} 

Start Up File

services.AddScoped<DataInterface, DataService>();
services.Configure<AppDbConfig>(Configuration.GetSection("DatabaseSettings"));

AppDbConfig Class

public class AppDbConfig
    {
    public string ConnectionString { get; set; } = null!;
    public string DatabaseName { get; set; } = null!;
    public string CollectionName { get; set; } = null!;
    }

DataService Class

private readonly IMongoCollection<startup_log> startupLogs;
    public DataService(IOptions<AppDbConfig> settings)
    {
    MongoClient client = new MongoClient(settings.Value.ConnectionString);
    IMongoDatabase database = client.GetDatabase(settings.Value.DatabaseName);
    startupLogs = database.GetCollection< startup_log >(settings.Value.CollectionName);
    }

Start Up Log File

public class startup_log
    {
        [BsonId]
        [BsonRepresentation(BsonType.ObjectId)]
        public string Id { get; set; }
        [BsonElement("hostname")]
        public string HostName { get; set; } = null!;
        [BsonElement("startTime")]
        public DateTime StartTime { get; set; } 
        [BsonElement("startTimeLocal")]
        public string StartTimeLocal { get; set; } = null!;
    }