bftanase
Should you not get a definitive answer here, I’d suggest to ask the ZVV customer service (freecall) who should know. It would be cool if you could confirm the outcome below, so someone else with the same question in the future might find it via search engines.
My personal gut feeling guess would be no, as by travelling to Einsiedeln you’re leaving that “local zone” which is defined by a => list of local stations you are allowed to travel between. In other words, that short stretch between the last of those local Rapperswil-Jona stations and the zone 180/181 border (e.g. Hurden) is probably not covered by the local zone ticket, as opposed to a regular zone 180 ticket covering the entire zone. But what do I know.