Are you basing your 5/3/1 %s on your actual 1RMs? You’re supposed to take 85-90% of your 1RMs and base the 5/3/1 %s on that number.
Also, Jokers are to be done after the 5/3/1 sets, not after supplemental (BBB in your case), if you really want to do them at all.
Lastly, I have no clue about the question, couldn’t figure out what you wanted. You can keep doing squats as a main exercise, and do chins and rows as assistance. Assistance means you do them after your main exercise work (5/3/1 sets and supplemental sets, like BBB).
Chins on one day, 50-100 reps depending on the program, rows on another day, 50-100 reps depending on the program. Your back will grow. If you want them to hit your arms more, do chins and rows with a supinated grip - easy tweak, no need to change exercises or the program. On the other two training days you can do curls if you’re hell bent on putting size on the arms.
You have a perfectly achievable goal (bigger back) that sinergizes with another perfectly achievable goal (bigger arms) without the need to tweak, change or remove any of the main stuff of the program, just adjusting here and there your accessory stuff.