Back in the first beta of iOS 13.4, the final version of which is already available for download to all users, they found a mention of the CarKey function, judging by the description of which your iPhone and Apple Watch can become keys to car doors:
Back in the first beta of iOS 13.4, the final version of which is already available for download to all users, they found a mention of the CarKey function, judging by the description of which your iPhone and Apple Watch can become keys to car doors: