You need to break the problem down into small pieces and test each one before trying to do something that complex.
Can you put a simple text HUD on each player that says, “Player 1”, “Player 2”, etc.? Because if you cannot do that, then something complex like doing your own health and shield bars will not happen.
Use “var Canvases: [player]canvas = map{}” to load a “Player 1”, “Player 2”, etc. canvas on each player and I can tell you the next step.