Hi everyone,
I've adapted the code showcased in this youtube video from Godot 3 to Godot 4 made by David Art about two years ago.
I also started to make some improvements with the ultimate goal to be able to set a given number of biomes (10 by default will be from 1 to 10) and generate a tilemap (base square & hexagon tiles) and easy to integrate in your own game.
Feel free to contribute and add new features you may need and could be useful for others as well as report issues if you find any.
(there is one weird case when generated texture is all messed up but it doesn't happen often)
Happy new year 
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