SpaceshipDemo/LocalPackages/net.peeweek.build-frontend/Editor/Assets/SceneList.cs

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

public class SceneList : BuildFrontendAssetBase
{
    [Header("Scene List")]
    public SceneAsset[] Scenes;

    protected override void Awake()
    {
        base.Awake();

        if(Scenes == null)
            Scenes = new SceneAsset[0]; 
    }

    public string[] scenePaths
    {
        get
        {
            if (Scenes == null) return null;
            var scenes = new List<string>();
            foreach(var scene in Scenes)
            {
                if (scene != null)
                    scenes.Add(AssetDatabase.GetAssetPath(scene));
            }
            return scenes.ToArray();
        }
    }
}