Thanks for joining the thread. I know how this feature would be useful in QuickBooks Online.
To stay updated about the new features in QuickBooks Online you can check out our QuickBooks Product Updates on the Firm of the Future Blog.
For future reference, I'm attaching some helpful articles with detailed troubleshooting steps when encountering problems with tracking miles:
If you have any other concerns about mileage, please feel free to reach back out. I'd be happy to help. Have a great day!