Chromosight's kernel submodule contains each default kernel in the form of a dictionary whith the kernel name. The items of the dictionaries are the key-value pairs from the kernel's json file, with the kernel matrices pre-loaded under the "kernels" key. Here is the kernel submodule can be used to extract the first borders kernel:
import chromosight.kernels as ck
kernel = ck.borders['kernels'][0]
chromosight.kernels