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I just asked if people that bought the game from GOG would be able to download the mods in Paradox stream. They answered that they will host the mods on their website. Just search for Paradox Mods.

To people that might be curious about the same question. I almost canceled my preorder because of this. I am glad I did not. Enjoy the game.
for me its a similar question, most mods will be released in stem...ho can i integrate it here to my gog game? i already added a new game to steam, but i can not see the mods i just subscribed in steam...

thanks so much for helping :-)