I have a typical European failsafe bell transformer installed in my electrical box, wired to a classic ding-dong chime (works at 230v and 8v). I wonder if there is any component or a simple DIY solution that allows me to connect this legacy system to the Zigbee or MQTT network so that I can set up notifications on the mobile devices (and other systems), without migrating to an unneededly expensive (and unattractive) modern video doorbell. Note that many European-compatible video doorbells do provide this possibility (Ring, Netatmo), but I haven't found any standalone solution just for the bell notification without bells and whistles (pun intended).
In other words, is there any easy-to-use accessory on the market that monitors a wire for a current and acts as a remote switch upon detecting it? Without wanting to dive into product recommendation, can you mention some?