External Chime for Doorbell V2?

I’m not aware of one. There’s a Wishlist topic for the original Doorbell chime to work with Video Doorbell v2:

You can vote for that and add your comment, but I’m not sure how useful that is for a topic that’s marked Probably Not.

There’s also a “Cameras as Chime” feature that allows Cam OG, Cam OG Telephoto, and Cam Pan v3 to be used as accessory chimes, but it’s buggy, especially with the new v3.0 app.

If you have any smart speakers or displays in your Google Home, you can use those like accessory chimes for Doorbell button presses, but this doesn’t appear to be a native Wyze-Google integration yet and generally requires a work-around, usually with a Wyze Plug.