Yeah that’s possible but since he has a title and hes not a huge lww, i can see loma trying to add one more division to his legacy
I'm sure Lomachenko likes the appeal of another belt at another weight class, and it would help his legacy no doubt, but going up and fighting a legit puncher first up (irrespective of size) just won't happen, not at this point of his career. If it was Rolly he might though lol.
He's not a 135 boxer as it is really, let alone a 140er.