Question about steamworks

In the unity multiplayer course, we are using steamworks to play the game with our friends. I read the documentation and in that i saw that we can do matchmaking in order to find a game. Can we implement this to the rts game, like making a button that searches existing lobbies, and if it cant find any, then it will host it on the (person who searched for it)'s computer. Or will i have to host dedicated servers for steam to do matchmaking.

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