Shelly 1 with existing 12V doorbell

I apologize if this has been answered previously but I can’t find an answer for the way I want to integrate it. I have a standard wired doorbell running off a 12V bell transformer on my consumer unit. What I would like to achieve but can’t quite work out the wiring is when the button is pressed to be able pass that through HA. Methods I have already seen require an additional power supply but I would like to use the existing 12V supply from the transformer to power the Shelly plus the bell circuit.
I have attached a couple images to hopefully help.

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Hi Nathan, I have the exact same setup. Were you able to figure this out? Would you care to share a small diagram on how to achieve this?