Right now in Origin you can pick up the add-on for free “In the name of the Tsar”released for Battlefield 1 in 2017.
This is the largest expansion in the history of the series, adding the Eastern Front of the First World War, the Russian Empire, the Civil War in Russia and the Red Army. “In the name of the Tsar” opens access to new maps, regime, factions, vehicles, 11 units of Russian weapons and much more.
You can also play the Supply Drop mode, which is only available in the DLC.
Apparently, an add-on can be added to your library without having a base game. But you can’t do without Battlefield 1 to launch.
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