StreetLight/Assets/StreetLight/Configuration.cs

using Newtonsoft.Json;
using System;
using System.IO;
using UnityEngine;

namespace Assets.StreetLight
{
    public sealed class Configuration
    {
        public string CalibrationFilesDirectory { get; set; }

        private static readonly Lazy<Configuration> lazy = new(() => JsonConvert.DeserializeObject<Configuration>(File.ReadAllText(Path.Combine(Application.streamingAssetsPath, "Configuration.json"))));

        public static Configuration Instance => lazy.Value;

        private Configuration() { }
    }
}