Is there any way to see items in advanced checklists in the dashboard, rather than only cards?
Trello Dashboards are very limited unfortunately. I haven't managed to find any workable use case for them to be honest.
However, You can report on checklist items in BlueCat Reports, which also allows you to create amazing dashboards:
https://trello.com/power-ups/5d9c90aa18965066fcd44730/reports-by-blue-cat
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