Yeah depending on how far out you define jumpers, 35% isn't terrible. It's not good or anything, but it's not a total joke.
For some reference, last year the league shot 40.3% from 3-9 feet, 42.7% from 10-15 feet, and 38.7% from 16-23 feet. (So when people complain about how the mid range jumper is a lost art; it's also at least partially because it's a low percentage shot) So like I said, Jerami wouldn't be even average from there right now, but he's not hopelessly behind.
I might disagree with your last statement, I feel like the few jumpers Jerami takes, at least from the top of the key, come off ball reversal and are catch and shoot. Well, usually its catch, look around, and then shoot, but you know what I mean. I have no numbers to back that up though.