ただのMonoBehaviorでEntityをいじる方法

using Unity.Collections;
using Unity.Entities;
using UnityEngine;

public class TestBehavior : MonoBehaviour
{
    private EntityManager _entityManager;
    private EntityQuery _entityQuery;

    private void Awake()
    {
        _entityManager = World.DefaultGameObjectInjectionWorld.EntityManager;
        
        // 絞り込みたいEntityの条件を設定
        _entityQuery = _entityManager.CreateEntityQuery(/*...*/);
    }

    private void DoAnything()
    {
        var entityArray = _entityQuery.ToEntityArray(Allocator.TempJob);

        foreach (var entity in entityArray)
        {
            /* ... */
        }

        entityArray.Dispose();
    }
}