I would like to have a widget that just shows a value.

The value should be able calculated based on the grouping. As an example showing the sum of the estimate on a board, or a sum of the timesheet on a board, etc.

Personally I would also love to be able to show a value from a specific card and field. But I assume that would not be easily achieved as this might need to be from another board that what the dashboard is set to fetch data from.

See mockup in image