Using steam wallet for purchases

[Greascar 24]

i have my battle net and steam accounts linked. Do I need to have the game downloaded on steam in order to use my steam wallet or can i just purchase something on steam, like the complete hero pack, and still get it without having to download the game on steam?

[ꉔꏂ꒐꒒ꇙ]

"Downloadable Content
This content requires the base game Overwatch® 2 on Steam in order to play.

So, you would need to download the Steam version.