Can't figure out what doorbell will work on existing system

Hi all, Looking for a little advice. I've moved into a house built in the 1990s. It's got a small mechanical bell chime (like a little school bell), and after testing with a multimeter it appears to be an 8V AC system.I probably have enough knowledge of electronics to be dangerous - I assume the existing system is just an 8V loop with the mechanical bell and the switch in the doorbell in series, when you press the button it closes the circuit?So I can't figure out how the Ring doorbell would charge off the power supply without closing the circuit and activating the bell?And I was looking at the non-battery hardwired doorbell, but I need to "bypass" the existing mechanical bell, and possibly wire a resistor into the circuit, which I don't fancy doing.I suspect I may be overthinking it, the website suggests the battery doorbell hardwired in would charge and also activate the mechanical bell when pressed? Is that right?