can you buy the DLC on steam?

[resensee]

I have the original game and would love to get the DLC. I looked and did not see it on steam. Thanks

[Faedrill]

So you buy something without knowing what it includes.
From the Store page.

The Game of the Year edition comes with:
Base game
Flames of the Inquisition Arsenal, Armor, and Armored Mount
Dragon Age multiplayer Deluxe Edition chests
Skyhold Throne, Red Hart Halla, and Bog Unicorn
Digital soundtrack
Jaws of Hakkon DLC Pack
The Descent DLC Pack
Trespasser DLC Pack
Spoils of the Avvar — 5 new mounts, 2 new sets of armor, and new options to personalize your base at Skyhold.
Spoils of the Qunari — an armored war mount, new armor sets — including one in the style of the Arishok — and Skyhold items.

[Nish-Ki]

You cannot buy the DLC separate on steam.
Steam version is it's own game, even in the Origin launcher.
It's techinically "Game of the Year" Version, on steam.
Though you can toggle all the DLCs in steam's dlc download window, but the only DLC that shows up is Deluxe edition, basically extra goodies.