Osimhen must move to a team that can offer him the chance to win trophies. I doubt if he wants to move to Chelsea although Chelsea can pay him more expensive than other teams. Chelsea is just a mediocre team in EPL, Osimhen won't expect any trophy with Chelsea.
With how well the two signings for the Arsenal Coach, Declan Rice and Kai Havertz are doing in the club, the owners of the club will not hesitate to throw their support behind any other player that the Arsenal coach identifies as needed to end their long season without the title. If Arsenal coach picks Victor Osimhen as his primary target, Arsenal could make sure to meet the fee required. Arsenal are also very good candidates to win the league this season, and are in the round of 16 0f the champions league, that can be attractive for Victor Osimhen. He can be attracted by the thought of coming to help Arsenal achieve their long time goal.