New Input System - Treating multiple controllers as one

Hello, I'm trying to make a local multiple player game and I'm not very good at programming. I managed to implement the new input system but struggling to get it working with two controllers.

How do I let the game know that the input is coming from a different controller? I know this was possible in the old input system but is there a way to do the same in the new one too?

Thank you in advance!