No need since it is already explicitly stated in the existing rules how you handle it after character creation:
SR6 p. 69 Character Advancement - Qualities
Qualities can be obtained in two ways after character creation; they can be purchased, or they can be earned.
Purchased
Purchasing a positive quality requires spending twice the normal Karma cost. New negative qualities cannot be “purchased” in an effort to get moreKarma after character creation, but negative qualities the character already has can be eliminated by paying twice the base Karma bonus.