It's wack that it doesn't sync, nearly all navigation systems out there do.. but Tesla hasn't caught up to that kind of advanced tech =)
What I usually do is ask Siri to give me directions to a person or place, then share that result to the Tesla app on your phone - which in turn pushes the correct address to use for Tesla's navigation system. The process works pretty well
I haven't bothered yet, but you could craft a Shortcut (again, Apple's eco-system is what I'm used to) that would use the variable of the place or person you'd like to navigate to, then auto-share to Tesla's app. This way it can all happen without taking eyes off the road
One thing I've figured out, if you have to fiddle with the phone and run the early FSD trunk of updates.. make sure to take OFF FSD while digging up the contact and sharing to the Tesla app, to avoid the risk of the driver's snooping camera dinging you for using the phone while driving. Counter-intuitive for us beta testers, that we can't use the FSD for a moment of safety while doing a quick task on the phone.. but hey, it's worth it for now