No. Games bought from UPLAY cant be linked to Steam. You can only add them as a non steam game like every other game that is not on Steam. But that just gives you a link to start the game on Steam, the game will still need UPLAY to run at all and you have

To connect the own Steam Account with Uplay, it brings real benefits. So Rewards from the Uplay System directly on Steam and receive all of the achievements will be synchronized between the two systems. We will show you how both systems can link to.

Open UPlay, log out and exit uplay; Goto Steam and launch your UPlay game (e.g. Anno 2070) Login to UPlay and you get the option to link pop up; Close Anno 2070, unless you fancy playing it; Now you can make it add your steam friends into UPlay by going t