For anybody still having the same problem as OP (or myself), I've written the customer support and received this answer:
Meaning: There is no such functionality implemented. (Even though it would easily be possible.) You only can backup an PowerTag Amiibo you already created beforehand.
So if...
Shawnita used to get her pills from some other street pharmacist and after switching to The Psi Discount plan she now only has to swallow two things a day!