That's the latest schematic we have. The source is there, so it's probably up to you to figure out how to do the import. As it seems that you managed to use the kicad footprint we shared for the Bela cape, you can import the eagle schematic into kicad and do the work there to make a footprint you can use. Ultimately, the footprint of the Audio Expander Capelet is very similar to that of the Bela cape, it just adds a handful of 2.54mm headers, so it shouldn't be too hard to modify the Bela cape footprint for your purpose.
