Question need help with save and load a dictionary containing scriptableObjects

using UnityEngine;
using System;
using System.Collections.Generic;

public class GameManager : MonoBehaviour
{
public Dictionary<VehicleData, Dictionary<WeaponType, WeaponLoadout>> weaponBase = new Dictionary<VehicleData, Dictionary<WeaponType, WeaponLoadout>>();
}

public class GarageSystem : MonoBehaviour
{
public Dictionary<VehicleData, Dictionary<WeaponType, WeaponLoadout>> equippedWeapons = GameManager.Instance.weaponBase ?? new Dictionary<VehicleData, Dictionary<WeaponType, WeaponLoadout>>();
}

[System.Serializable]
[CreateAssetMenu(fileName = "VehicleData", menuName = "Vehicle Data")]
public class VehicleData : ScriptableObject
{
public string carName;
public GameObject prefab;
public int cost;
}

[System.Serializable]
public enum WeaponType
{
Primary,
Secondary,
Melee,
}

[CreateAssetMenu(fileName = "WeaponData", menuName = "WeaponData")]
[System.Serializable]
public class WeaponData : ScriptableObject
{
public GameObject weaponPrefab;
public int cost;
public string weaponName;
public WeaponType weaponType;
}

public class WeaponLoadout
{
public List<WeaponData> unlockedWeapons { get; set; }
public WeaponData equippedWeapon { get; set; }
}