Electric vehicle routing is an option in Apple Maps and I'm assuming in Google Maps as well. A Rivian app could handle the rest. I'm pretty sure Apple would be extremely happy to figure out a way forward.
(https://support.apple.com/guide/iphone/set-up-electric-vehic...)
Important to note as well that you can technically support CarPlay and Android Auto just for the infotainment and keep the map function in-house running along with it.