Opt in / opt out for communications via TNEW

Are there ways for guests to opt into or out of communications from Mystic, via TNEW? If we want to have a checkbox like the following:

Is that doable?

The closest I can see would be linking guests to their own 'Interests' page, which would take them out of the flow of the transaction. Is there another way to mark, in Tessitura, that a guest who bought tickets online checked a box to give permission to be contacted?

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