On top of the Card’s Activity entries, Board Export should also have option to include the Board’s Activity entries (e.g.: “User A enabled the Board Export for Trello Power-Up”, “User B deleted card #10 from List A”)
Ideally, the exported Board Activity should list out all the activity logs (inclusive of Cards’ activity logs) in a single page/column entity, giving users a clear overview of all the activity logs in the Board