Jovic is the best young striker in the game for me, in some saves he can literally have all around stats to be unstoppable. I have seen him do 100 + goals a season and for me was the all time Italian goalscoring record holder. He broke every single goal scoring record there was it's pretty easy, Luka Jovic.
I think if you want to get the best out of him i would train him from the start of the game and get him on some heavy training. He can play any of the role's up front but i really got the best out of him training him in strength and quickness and playing him as a target man.
How long does he take to come good?