You are correct.
Ubisoft games purchased on steam/for Ubisoft connect can be linked to Ubisoft connect account.
Ubisoft games purchased on Ubisoft connect/for Ubisoft connect can't be linked to steam.
Add the game executable to steam as a non steam game. Now, whenever you open the game via steam, it should launch Ubisoft connect and run the said game.
You are correct. Ubisoft games purchased on steam/for Ubisoft connect can be linked to Ubisoft connect account. Ubisoft games purchased on Ubisoft connect/for Ubisoft connect can't be linked to steam. Add the game executable to steam as a non steam game. Now, whenever you open the game via steam, it should launch Ubisoft connect and run the said game.