I think the Generic female header in Core parts is an individual 1 pin drawing that gets assembled internally in the program based on the selection in Inspector, so you can’t make parts that vary easily.
I only made the PCB svgs’ to check if parts hit on my board - this is importable PCB views not fully importable parts -, but if anyone wants my 90º right angle header PCB svg with 40 pins here it is.
Female
Male
You can cut them up or extend them in Inksacpe for other pin counts, and then just add the svg to an edited part’s PCB view of the pin count you need.
This is mainly if you need the silkscreen to tell you if parts hit on the PCB.