AVC
Assuming both of you are using your own (separate) SwissPass accounts on the respective phones, this won’t work, as any (active) ticket information is linked to the Swisspass account which was used for the ticket purchase.
However you could download the SBB Preview app on your phone (= “Final Beta” version for testing new mobile app features) and login with your wife’s Swisspass account on that one. Then “your” tickets will also appear on your phone in the Preview app (and could probably be transferred to the Apple Wallet under iOS).