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Jacks can appear on the second pass. That often comes too late, certainly if we are playing in a minor.
The other thing we do is 4♦ non-step to look for "good" trumps.
Jacks matter a lot in an 8-card fit, not so much in a 9-card fit.
Qxxx --- Kxxxx is a shade over 50%, so okay. We live with that, while realising jack or 10 would make a lot of difference.
Q432 --- K765 no pips is 14%
QT32 --- K765 is 45%
QJ32 --- K765 is 71%
2nd pass picks up the jack for us.
Skipping says KQxx, KJxx, or QJxx (NOT AJxx since partner often needs to split A from KQ)
This works after a fashion with majors, though you will play 5M or even 5NT with shaky trumps.
Our other method is 4D Slam Try either (1) after strength known or (2) straight after shape is known.
With (1) it says "Bid bad potential trumps suits upwards. My next bid will be a natural slam try, requiring good trumps."
Good trumps means Qxx for shortish suits, QJxx for 4+ suits. This picks up
AQJxxx --- K
AKxxx --- Qxx
Kxxx --- QJxx
Often asker thinks "I need ♥Qxx for starters" so we might see 4♦ - 4♥ - pass.
After 4♦ - 4♥ - 4♠, describer with HHxx bids on. Then you can split AQxx from QJxx.
Likewise 4♦ - 4♠ - 4NT = "Hearts are trumps. How good are your "good" hearts?"
You don't have these extra asks in minors, unless you assign a meaning for 4♦ - 4NT.
With (2) partner's shape may have come out too high to risk a simple strength ask. (3♠ = 6-4-3-0 say)
Now 4♦ says "Bid 4♥ with a minimum, or a MAX with bad hearts." MAX is loosely defined.
With a minor as trumps, you might decide that QJxx is not good enough to proceed
East showed 0-7, then 5-7 bal, no Major, then 5♦s
3♥ said "Forget final shape. How strong?" 3♠ showed a minimum. (2-3 SPs)
Then 5♦ said bid slam with good trumps.
Good that West had the jack. KQ is good, Axxxx is not enough.
