Documentation on nrf5340 network core

Hi,

I'm building an application for the nrf5340 in rust and I want to be able to use the bluetooth LE audio functionality. For this I have two questions:

  1. How can I build the network core software separately so I can use that with my own application core FW
  2. Is there some documentation on how to communicate to the network core and use it for the LE audio usecase.

I'm currently interested in using it as a CIS server.

Thanks in advance.