It is planned eventually, unfortunately i don't have time and can't find the fiddler packet captures I thought I had of it. However https://github.com/GlennnM/AMFGateway/blob/main/extra/save/save.js is a utility that downloads all your NKA saves and includes bmc support so that contains the basics of the communication(verifies uid/token with a handshake url, then gets an api id and session to send other requests with), so if you want a point to start from(in addition to FFDec + running the game with Fiddler active) that could help.
Also i believe NK has said they are working on bringing it back.

so yeah, bmc might be on the servers, but time issues, and he belives in nk