Hello Ckigheashoi22
It depends if they are still available. If they are, they are probably more expensive than a point-to-point ticket, that’s why the system is not offering it.
You have to check it’s availability here:
https://www.sbb.ch/en/tickets-offers/tickets/day-passes/saver-day-pass.html
The Saver Day Pass is not very useful in the Jungfrau area, as it does not cover Grindelwald / Wengen to Jungfraujoch or Grindelwald to First. The Saver Day Pass does not cover mountain excursions (with a few exceptions: of Mt. Rigi, Mt. Stanserhorn, Mt. Rochers-de-Naye, Stoos, Klewenalp). The Jungfrau Pass, or the Bernese Oberland Pass, might be more useful.
https://www.berneseoberlandpass.ch/
https://www.jungfrau.ch/en-gb/jungfrau-travel-pass/
Also, you should consider the Swiss Half Fare Card in addition. It allows purchasing tickets (and the Saver Day Pass) as well as mountain excursion tickets at reduced fare. And, it comes with the complimentary Swiss Family Card for free travel for kids:
https://www.myswitzerland.com/en-ch/planning/transport-accommodation/tickets-public-transport/swiss-family-card/
Let us know if you have more questions.
Kind regards,
Roland