Loading SSL certificate from file in a WEBAPI2 service

Question

Hi,

In a c# webapi selfhosted (localhost) OWIN scenario , how I can configure the WebAPI, for a ssl connection, in order to reading the private key certificate x509 from an file/stream ?

Note, I don't to want use the local certificate store and register there the private certificate.
More details, I found an implementation of OWIN server that accept to set X509 certificate from file path. It's also possible do that with Katana server ?
https://github.com/Bobris/Nowin

Thanks