Arsenal is the team most associated with Osimhen, maybe there is Chelsea in the name but in reality Chelsea have to spend quite lot of money to get him and I not sure Chelsea can be willing to spend more money to get Osimhen.
Unless the exchange option is truly approved by Napoli, this will be profitable for Chelsea.
Personally, I would be much more interested if Arsenal really got Osimhen because his chances of winning the title would be more open, apart from that Arsenal also have pretty good squad for the past two seasons, staying with Napoli would be the same as hindering his own career.
Moreover, Antonio Conte also doesn't want to interfere too much in the matter of releasing Osimhen with Napoli because they already have their own agreement and Conte also can't keep him if Napoli basically aims to sell with the agreement they have.
Osimhen has release clause of 120 million euros and this could be reduced if Napoli agrees, it is clear that the decision on Osimhen future is in Napoli hands.
But on the other hand, if compare Lukaku with Osimhen, it is clear that we all know that Osimhen is far superior player and his departure and being replaced by Lukaku will never be worth it.