[y4mi]

there is no point in importing it. The system store is never referenced in this setup.

The master (this is the self signed part) cert becomes part of the client certs by signing.

These client certs are now only valid with the original self signed cert.

It's essentially a CA, only for the client certificates. It just isn't formalized because it's never imported. you'd also lose the ability to rotate the certs quickly without gaining any security by importing this self signed certificate as a CA.