The request for variable chime options on the hub has previously been requested in the following Wishlist thread. You can vote for it there, like some posts, and add your reply at the bottom.
There are some other options that can be accomplished in the absence of this capability though.
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Wyze Rule to activate a Cam Siren (30s default) when a V2 Sensor is triggered.
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Use an Alexa Compatible Smart Chime that can be activated thru an Alexa Routine when a V2 Sensor is triggered.
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Use Wyze Rules to turn on a Wyze Plug when a V2 Sensor is triggered and off after 30s. Plug a siren or chime into that plug.