I have not seen any “easy” (passive, reasonably priced, well tradable) target date funds in CHF. If any exist, they are probably shitty expensive actively managed funds issued by Swiss banks for the benefit of these banks.
So most probably you have to do it yourself.
While you may want to calculate target values of different assets yourself, it can be implemented, for a fee, with a robo advisor. Finpension is probably the best option.
To do it completely by yourself, you can check fixed income options in CHF.
For individual one time lump sum investment a Swiss government bond with the maturity date close to your target date can be an option, although I think the yield is suboptimal (indeed). Mid term notes of Swiss banks with a maturity term of 10 years and, later, shorter ones, should be a good option with more work for you and more yield, from my point of view. Both should not or cannot be touched until the maturity.
Bond funds will take an intermediate position with respect to duration and liquidity. Bank accounts and money market funds are the shortest duration and most liquid fixed income instruments.
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