Make a dumb doorbell smart with Shelly 1 - Share your Projects! - Home Assistant Community

Where you already able to connect it? Otherwise you can connect the cables according to how they are connected to your transformer. See this post 34 for more details. You should be able to use the way Rubueno describes the wiring.

Shelly support group (English Version)

Make a dumb doorbell smart with Shelly 1 - #143 by jobganzevoort

Make dumb doorbell smart - Hardware - Home Assistant Community

Make a dumb doorbell smart with Shelly 1 - #38 by gerard33 - Share

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Making a doorbell smart using a Shelly 1 and Home Assistant

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Making a doorbell smart using a Shelly 1 and Home Assistant

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