Don’t ask, that’s an invite for you to go with no redundancy, or standard redundancy.
What you can do, when the topic comes up, is make clear that IF THE DEAL WAS GOOD ENOUGH you would consider going voluntarily. You manager might be very supportive but you get your redundancy package on it that someone else in the chain is tasked with doing it as cheaply as possible and doesn’t really care about you personally.
I wouldn’t go rushing to the boss’ door either.
My brother’s place were doing a years salary for everyone they were letting go. That was enough of an offer for him to say he’d do it. They refused as his role was too critical and they would have had to hire a replacement – so he realistic is there someone there who can pick up your work (and if there is are they likely to stay, affordable etc) if so you could even drop that into discussion as that is one of the headaches management have to juggle and it’s not always obvious who knows what.