Help with wiring shelly to doorbell

I’d like to wire shelly 1 to my classical doorbell which operates at 12 V. I’m not sure how to do it, here is my existing wiring. Can somebody please let me know how to connect wires to the shelly 1 ports?

Buy a KaKu acdb7000b

can’t find anything in English about it

No its a dutch Brand. Even though do you think a shelly is the best solution? There are other ways to do this

I’m open to it. Just want to open my gate also via Homey, not only by pressing the button.

It is very hard for me to asses your situation. How is the gate connected

See my post here: Make my dumb "gong" smart - #6 by Retrospected