Can I transfer the progress from a single game from a PS4 account to a different PS5 account?

Hello! I’ve recently been wanting to get a PS5, but I have a problem. I currently have a PS4 which my brother and I both play on. The thing is, he isn’t willing to give me the account altogether because he has progress on a game there that he doesn’t want to give up. I played a lot of RDR2 Online on there, and therefore also have a huge amount of progress I don’t want to lose. Lots of money spent on battlepasses, hours spent doing missions, gathering things etc. With me now wanting to get a PS5, I know you can transfer your whole account from a PS4 to a PS5, but I was wondering if there was any way to transfer only the RDR2 progress from the PS4 account to a completely different PS5 account. Help in any way is appreciated.