Report creators can include a summary row in the "Table" and the "Aggregated Table" views.
(this row will be added to downloadable and displayed datasets in the 3-dot chart menu)
Summary row options are customisable and can be found in the Table's "Totals" menu (see image below), including the Totals title naming and styling of the summary row.
Users have control over each individual column's aggregation function within the summary row (accessible from the cog button in the column header > Field picker 'pill'), so for some fields the user can pick sum, mean, max or another statistical function, or leave the summary cell blank.
For the text fields the applicable summary functions are singleton (single value that appears in all cells), mode, unique value count, non-empty and empty count, min and max.