How do I display summary calculations in the footer of a PrimeNG table?

I'm having a heck of a time finding out how to do a simple summary function at the end of a PrimeNG p-table. For example, if I want to total a particular column in the last row of the table, or display the minimum of a value of integers, or any other summary operation like that — for whatever rows are visible in the table at the time.

I've tried rolling my own by accessing PrimeNG's Table object itself in the component:

@ViewChild('dt', { static: true }) private dt: Table;

And then looking at the contents of that via

console.table(this.dt)

I can access the filteredValue property of this.dt once I've typed something into any of the column filters. But I can't access what's in this.dt.value or this.dt._value. PrimeNG's documentation makes mention of a "Summary section" but gives no guidance on how to perform summary functions in that section:

PrimeNG documentation for Table

Perplexed.