A lightweight helper to forward trigger events from a GameObject to listeners.

TriggerEventDispatcher.cs

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

public class TriggerEventDispatcher : MonoBehaviour
{
    public delegate void OnTriggerEnterEvent(Collider other);
    public event OnTriggerEnterEvent TriggerEnter;
    
    public delegate void OnTriggerExitEvent(Collider other);
    public event OnTriggerEnterEvent TriggerExit;
    
    void OnTriggerEnter(Collider col)
    {
        TriggerEnter?.Invoke(col);
    }
    
    void OnTriggerExit(Collider col)
    {
        TriggerExit?.Invoke(col);
    }
}