I'd love to be able to link to Trello and be able to spin my cards in various ways. See number of open cards, number of cards assigned to members, etc.
Data from Trello boards can be exported to CSV and then imported into Power BI. You can then perform your queries against that data. Not ideal since it's not a live update of the Trello data, but it's one way to slice and dice your Trello stuff.
