How To Create Custom Properties In A Node?

Godot Version

4.3

Question

I’m trying to make a custom property for my Gun node that I can change the delay between shots, how am I able to do that?
gun.gd

extends CharacterBody2D


@export var player : Node2D
@export var distance_from_player : float = 100
@export var bullet_scene : PackedScene 

func _ready():
	position = player.position + Vector2(distance_from_player, 0)

func _process(_delta):
	var direction = (get_global_mouse_position() - player.position).normalized()
	position = player.position + direction * distance_from_player
	look_at(get_global_mouse_position())

	if Input.is_action_just_pressed("mouse_left"):
		print("Mouse Click Detected!")
		shoot_bullet(direction)

func shoot_bullet(direction: Vector2):
	print("Executing shoot_bullet()")
	print(bullet_scene)
	if bullet_scene:
		print("Spawning Bullet!") 
		var bullet = bullet_scene.instantiate()  
		bullet.position = position
		bullet.direction = direction 
		get_parent().add_child(bullet)  
	else:
		print("Error: Bullet scene is not assigned!")

Like another @export variable?

@export var delay: float = 1.0

Thanks, I didn’t realize it was that easy.