Help wiring a new Wired Video Doorbell

I'm in the UK and looking to install a Ring Video Doorbell at my in-laws to provide some additional security/surveillance. So, I've read lots of help guides and watched lots of videos, but still not 100% sure that their existing setup will accommodate a hardwired Wired Video Doorbell i.e. the version without a battery. They currently have the following setup: - Transformer by the consumer unit: Terraneo 672 230V AC to 8V (from what I can gather). This web page appears to show the same transformer: https://catalogue.bticino.com/BTI-672-EN - Friedland 954 door chime. The house was built around 35 years ago and I believe this was installed as part of the build (possibly the same with the transformer), so quite old! - The door bell itself seems to be a simple "contact" type, with 2 wires each connected to a contact, so no illumination or anything extra. I have photos of the inside of the chime, but don't see an option to include them in this post! I will therefore try to describe the wiring, which seems a little unusual. There are 4 terminals inside the chime (nothing unusual about that), but only 3 of them appear to be used! The terminals are labelled 0, 1, 2 and 3. Two bell cables enter the chime, each with a pair of wires. I'll call them cable 1 and 2, and wires A and B, so we have wires 1A, 1B and 2A, 2B. Here's how they are connected: Terminal 0: wire 1A and 2A i.e. a single wire from each cable is connected together on this terminal. Terminal 1: no wires Terminal 2: wire 2B Terminal 3: wire 1B At this point I haven't determined which of the two cables runs from the transformer and which runs to the doorbell. Based on all the information provided on the Ring website, this seems to be unusual as the door bell cable is expected to be connected to 2 different terminals and no examples show any of the doorbell wires being connected to the transformer wire! Photos are much easier to understand, so if there's a way I can upload the photo, please let me know. Anyone understand how this chime wiring would be changed to accommodate the Wired Ring Doorbell? Is the transformer compatible? It needs to be 8-24 VAC. The writing on the transformer suggests it is 8V AC, which I think is acceptable! I've read of instances where the Ring doorbell has blown transformers, which is a little worrying! I understand that when using the Wired Ring doorbell, the chime is bypassed, so it will be necessary for me to install a Ring Chime or Echo device to generate the doorbell sound, however, the wiring examples still show wires from the transformer connected to the chime. Why is that? Are they using some component of the chime in order to work? An alternative install method seems to be to wire the transformer directly to the door bell, however I believe a resistor is required, although this may be the case when using a doorbell containing a battery, I can't remember - two many options and variations to remember! I would appreciate any advice/thoughts and answers to my questions. Thanks.  PS. Just realised I could upload the photos, but limited to one photo as a new user, so I've uploaded the insides of the chime.