Hoo thank you for the quick reply it is really appreciated !
But no problem if it was a poc and take your time !
To be honest i tested laigter and other similare software to create normal & specular map for sprites,and i turned that Laigter gave the best results when I asked artists for the results ! So i wanna use Laigter
And when i saw this plugin for Godot i was just amazed to see luckily i was as i'm using Godot ! So i'll wait it to be on the next Godot version :)
But anyway, if you need any help let me know it will be a pleasure to help here !