ACF allows supplying a p12 certificate file and password to use as the client certificate for authenticating to a webserver. Lucee does not implement this.
Apache common's HttpClient has the capability built in to accommodate this request, but it is not implemented in Lucee yet.
I have a working implementation using Apache common's HttpClient in CFML/Java. I'll try to create a fix for this and open a pull request.
ACF documentation: https://wikidocs.adobe.com/wiki/display/coldfusionen/cfhttp
Railo issue: https://issues.jboss.org/browse/RAILO-2823