Adding VAR sounds like a fancy addition and would make the game more realistic, but i don’t think VAR is needed in a video game. Not because i think it requires huge work, it is their job to put in work if something that will make the game better needs to be added, but because i think it would ruin the feel of the game.
in order to add VAR, referees need to make mistakes, goals that are offside would stand until there’s an on-field review, and yellow cards will have to be reviewed and upgraded to a red card after a review, etc. The right decisions are already coded into the game and it works great that way, so better to move on with that. VAR reviews could stir up uncertainties, take up time and make the game somewhat boring.