AsyncHTTPClient http proxy authorization with a certificate

We have a mTLS proxy server in DMZ, and client applications with auth certificate can send requests to private network through it. Currently I using iOS 17.0+ api:
ProxyConfiguration.init(
httpCONNECTProxy: NWEndpoint,
tlsOptions: NWProtocolTLS.Options? = nil
)

sec_protocol_challenge_t is called then proxy asks auth certificate and all proccess is working.

How to setup TLSConfiguration for certificate auth on mTLS proxy ?