Italian teams cannot afford the high price asked by Napoli and regardless of what the player express regarding playing in another Italian team, I highly doubt Napoli will let him play with their direct opponents!
For Juventus, it appears they figured out a way to bring Lukaku from Chelsea although rumours are still mentioning an eventual swap deal with Vlahovic.
Based on Serie A transfer records, Juventus had 1 expensive transfer from Napoli in the 2016-2017 season for Gonzalo Higuaín. Juventus recruited Gonzalo Higuaín with a transfer value of 90 million Euros at that time, but in the 2018-2019 season Juventus again completed an expensive transfer for Cristiano Ronaldo with a value of 117 Million Euros.
So nothing is impossible about the possibility of Victor Osimhen moving to another Serie A team. Juventus can complete the transfer, but I don't think Victor Osimhen is worth his current value. For now Juventus don't need to sign Osimhen, but I hope they can have a good striker to contribute a lot to them next season.