I think everyone should be able to admit arm strength is not an asset for Jones.
Regarding his accuracy, he completed 67.6% of his passes this season. The all-time career best completion percentage is 67.8% so to expect Jones to improve much, if at all, on 67.6% seems pretty unrealistic.
He's never going to have the pocket mobility or running ability of Allen, Mahomes, Watson, Jackson... even Herbert can run a little bit. All of these quarterbacks have tremendous arm strength too.
So if Jones is going to improve anything at all then I suppose arm strength may be the most obvious thing. Right? I mean he's already hard-working, smart, recognizing defenses and reading through his progressions (which likely he can still improve on as well).