Hello orbaneszter
Thank you for your request.
There is no such offer for the specified route.
You may be interested in this offer: The Leisure Travelcard on the SwissPass | SBB
Alternatively, there are also the savings day tickets: Saver Day Pass – book earlier, travel cheaper | SBB
You can also get advice by phone on +41848 44 66 88 (CHF0.08/min) or free of charge at a staffed SBB counter about current offers.
I wish you all the best.
Greetings
DafineM