@Pseudo
I'm almost certain you do, unless you're instead going to change your existing wiring to bypass your existing chime. Conventional doorbells have an open circuit that is closed when the doorbell is pressed, which triggers the chime. But the Nest Hello needs continuous (but low) power to run the camera, which the chime connector provides by providing power from your transformer without tripping the chime. The Nest Hello also has a small internal battery that apparently triggers the chime when the doorbell is pressed.
It is possible to wire a Nest Hello without a chime connector. We have 3 Nest Hellos. Two are wired to our existing mechanical chime using existing doorbell wiring using two chime connectors. The third is for an entrance which was never wired, so that Nest Hello is wired directly to an OhmKat Power Adapter for the Nest Hello, which is designed to work with the Nest Hello without needing a chime connector. I've also seen a few posts here where customers have successfully wired a Nest Hello DIRECTLY to a transformer.
