@Wayne Mery you need to do this with the API. This Trellinator function will dump all comments from all cards on a board, including a link to the card, into a Google Sheet:
You can see how to set up Trellinator here:
Note that this function won't get "triggered" any way, you'd just run it manually from the script editor. If you wanted, you could run it daily, and you could install it on multiple boards for example.
If you had to thrive a new habit during a lockdown, what would it be? Trello
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