PokerStars, $200 + $15 - Hold'em No Limit - 250,000/500,000 (62,500 ante) - 7 players
Hand delivered by Upswing Poker

UTG (Hero): 20,844,140 (42 bb)
MP: 14,616,042 (29 bb)
MP+1: 4,606,646 (9 bb)
CO: 5,087,796 (10 bb)
BU: 36,369,591 (73 bb)
SB: 15,192,830 (30 bb)
BB: 35,540,564 (71 bb)

Pre-Flop: (1,187,500) Hero is UTG with J♠ J♥
Hero raises to 1,075,000, 2 players fold, CO 3-bets to 5,025,296 (all-in), BTN calls 5,025,296, 2 players fold, Hero ??

about 15th in chips. stack about average. 10 players to next payjump

in the last two orbits hero has raise/folded 4 times, thereof two times against co. In general co is probably rather too tight than to aggressive.
bu is at the table for ~10 hands. I donkt know why but for some reason he was marked as a strong reg, so lets assume he is.
To my right is a fish with a big stack if thats important for future ev or whatever.

I dont play a lot of tournaments and dont really know what ranges bu should be playing there. I could imagine you wanna have a shoving range with AK, QQ (JJ?) and a calling range with AA, KK, TT, 99, AQs (JJ, 88, AQo, AJs, KQs?)

call >> shove> fold ?