I’m presuming a library exists because I’ve seen questions about IDC connector footprints and why you don’t get a 3D model with it. I’d settle for just finding the footprints…well and the symbols too but this is the layout forum.
I’ve looked for IDC and Header, and I’ve found something on Github that says its for an earlier Kicad, 5 I think, but not current. I’m thinking the connectors might be listed by specific manufacturer part numbers rather than a generic description.