PivotPageArea
type PivotPageArea = { firstRow: number; labelCol: number; rowCount: number; valueCol: number;};Geometry of a pivot’s page-field (report filter) area, which sits above the pivot’s output area,
outside ref (Excel’s location/@ref excludes it). Offsets are relative to the top-left of
ref; firstRow is negative. The fields stack one per row in a single label/value column pair.
Absent (or null) when the pivot has no page fields.