There is a simple answer to this: No
E-tickets, Mobile Tickets, EasyRide / Fairtiq, Swiss Travel Pass tickets, and other travel cards (summarised, all tickets bearing the name of the passenger) must be presented with official identification (passport, ID card, resident permit, or driving licence) or the SwissPass card / SBB Mobile app.
Working as a ticket inspector myself, I often meet tourists during ticket inspection who only present a passport copy or a photo of their resident ID card, as they are afraid to take their passports with them, for security reasons or because they are afraid of losing it. However, kindly note, passport or ID copies, photographs, or screenshots are not accepted as they are not forgery-proof.
The only exception where electronic IDs are accepted is when the country has an official ID app, including all security elements.