Using SiriKit, iPhone apps can provide Siri with information about a car, including its battery SoC, maximum range and charging status. This information can be used by Apple Maps to provide EV routing information, which would be a good alternative to ABRP's routing information in certain situations.
Since ABRP can collect battery SoC and charging status information via OBD or through an online API, it would be nice if it could provide that information to Siri using SiriKit. This would provide iPhone users another routing option if ABRP's service is not available or not supported in a user's region.
More information about Car integration with SiriKit can be found here: developer.apple.com/documentation/sirikit/car_commands
It's an interesting suggestion, but it does face some challenges;
1. ABRP can only read data via OBD over an active Bluetooth connection - which for iOS requires the ABRP app to be actively running.
2. OTA connections usually don't report data frequently enough to be reliable in navigation (but it can vary depending on manufacturer and connection type).