Hi,
A source for repeated questions or feature requests is color separation. This tutorial explain the steps to separate a CMYK color format document into the individual C M Y K channels, and get a preview of total ink (areas exceeding a given threshold)
Color channel separation for export
Open the file,
and copy the color channel mixer adjustments into your file on top level.
activate only 1 of the 4 layers at a time
export as greyscale document (repeat 4 t