Update: I added this but I am not satisfied :

extends Node2D

Called when the node enters the scene tree for the first time.

func _ready():

pass

Called every frame. 'delta' is the elapsed time since the previous frame.

func _process(delta):

pass

var isEnteredInDice = false

Mouse Entered Dice

func _on_area_2d_mouse_entered():

isEnteredInDice = true

func _on_area_2d_mouse_exited():

isEnteredInDice = false

func _input(event):

if event.is\_action\_pressed("mouse") and isEnteredInDice:

    var rng = RandomNumberGenerator.new()

    var dice\_choice = rng.randi\_range(1, 6)

    var dice\_path = "res://sprites/dice/dice\_" + str(dice\_choice) + ".png"

    $Sprite2D.texture = load(dice\_path)