Hi Larissa,
Thank you for reaching out and providing your feedback! We currently do not plan to support travel summaries for administrative regions in truck routing. However, we are working to support countries and subregions (e.g., states in the US) in the itinerary. Please note that the itinerary will only include information about your waypoints and maneuver instructions.
If you have a waypoint near a state border that the route passes through, you will receive the mileage for the start > waypoint and waypoint > end of the route. Additionally, it will return the subregion the waypoint is in after we add the support, but it will not include information for every subregion by default.
However, you can easily derive that information by running a spatial query to check which state boundary the route path coordinates fall within. You can then get the route path length for each state, which will give you the mileage spent. If you need help with the script, let me know. There are many open data websites available to download US state boundaries, such as the US Census Bureau - https://www.census.gov/geographies/mapping-files/time-series/geo/cartographic-boundary.html