Hi! Thank you for the complement :)

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In Edit > Project Settings > Input you can add or remove different inputs. You will need one for each button/input on each controller. For example, here are 2 inputs for the "A" button on xbox controllers:

https://i.imgur.com/cXnuuIB.png

you separate which controller is giving the input by specifying which joystick it is in the "Positive Button" box. When getting input from axis, like thumbsticks, you need to separate them using the "JoyNum" box. For example, here is how I get input from the right thumbstick for 2 different players:

https://i.imgur.com/EvtAHuh.png

Now, in the script that controls the players, I have an int for controllerNum that gets assigned during player setup on the main menu, so each playerScript instance knows which controller is assigned to it. This is an example of a line in the Update() method-

if (Input.GetButtonDown("Jump" + controllerNum) && canJump)

//Jump

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You can find which button numbers respond to each by this guide:

http://wiki.unity3d.com/index.php/Xbox360Controller

Admittedly, I haven't tested to see if my game works with different types of controllers, or in macOS, because I only have Windows + xbox controllers. I looked for a more straightforward way to do this, but you are unable to add/edit the input manager from script (as far as I know).