How to read App Settings in .net core without dependency

AppSettingsReader.cs

using System;
using System.IO;
using Newtonsoft.Json.Linq;

/// <summary>
/// Provides methods to retrieve connection strings and app settings from the appsettings.json file.
/// </summary>
public static class AppSettings
{
    private static readonly Lazy<JObject> _config = new Lazy<JObject>(LoadAppSettings);

    /// <summary>
    /// Loads the appsettings.json file and parses it into a JObject.
    /// </summary>
    /// <returns>A JObject containing the configuration data.</returns>
    private static JObject LoadAppSettings()
    {
        var basePath = AppDomain.CurrentDomain.BaseDirectory;
        var configFilePath = Path.Combine(basePath, "appsettings.json");

        if (!File.Exists(configFilePath))
        {
            throw new FileNotFoundException("The appsettings.json file was not found.", configFilePath);
        }

        var json = File.ReadAllText(configFilePath);
        return JObject.Parse(json);
    }

    /// <summary>
    /// Retrieves a connection string by its name.
    /// </summary>
    /// <param name="name">The name of the connection string.</param>
    /// <returns>The connection string value.</returns>
    public static string GetConnectionString(string name)
    {
        var connectionString = _config.Value["ConnectionStrings"]?[name]?.ToString();
        if (string.IsNullOrEmpty(connectionString))
        {
            throw new ArgumentException($"Connection string '{name}' not found in appsettings.json.");
        }

        return connectionString;
    }

    /// <summary>
    /// Retrieves an app setting by its key.
    /// </summary>
    /// <param name="key">The key of the app setting.</param>
    /// <returns>The app setting value.</returns>
    public static string GetAppSetting(string key)
    {
        var appSetting = _config.Value["AppSettings"]?[key]?.ToString();
        if (string.IsNullOrEmpty(appSetting))
        {
            throw new ArgumentException($"App setting '{key}' not found in appsettings.json.");
        }

        return appSetting;
    }
}