For _get_property_list(), how to custom a new type of my own resource?

Godot Version

4.3 stable

Question

(Solved by adding the “hint” and “hint_string” for the property list)

I can see the 2 items in the inspector, Item 01 and Item 02. One is preloaded and the second one is un-assigned(empty).

In _get_property_list(),
I use

“type” : TYPE_OBJECT

for appending into the property list.
Is any way to specify loading type from inspector,
or create a new type about TYPE_XXXX when appending into property list?
Imgur

Just like using @export to specify the data type

@export var _item_03 : InvItem

Imgur
all objects in the list

only InvItem in the list.
Can do this in the inspector in the property list?

file 1

extends Resource
class_name InvItem

@export var name : String
@export var texture : Texture2D
@export var amount : int

file 2

@tool
extends Node2D

var _open : bool = true:
	get: return _open
	set(value):
		_open = value
		notify_property_list_changed()

var _item_name : String = "default name":
	get: return _item_name
	set(value):
		_item_name = value
		notify_property_list_changed()
		
var _item_01 : InvItem = preload("res://inventory/items/item01.tres"):
	get: return _item_01
	set(value):
		_item_01 = value
		notify_property_list_changed()

var _item_02 : InvItem
@export var _item_03 : InvItem

func _get_property_list():
	var plist = []
	
	plist.append({
		"name" : "_open",
		"type" : TYPE_BOOL,
	})
	plist.append({
		"name" : "_item_name",
		"type" : TYPE_STRING,
	})
	plist.append({
		"name" : "_item_01",
		"type" : TYPE_OBJECT,
	})
	plist.append({
		"name" : "_item_02",
		"type" : TYPE_,
	})
	
	return plist

By adding the “hint” and “hint_string” for the property list,
I can only pick the files with InvItem type.