It's a common misconception for the less tech savvy but you can just buy a USB-C to Lightning cable for a few bucks. In fact, here's a 3-pack for $7: https://a.co/d/1WFoRGZ
The constant dongle arguments are so funny, especially in this case.
1) You buy a USB-C to Lightning cable. Obviously.
2) Everyone bitches about Apple supposedly requiring all kinds of dongles, but of course, what caused that? Apple's insistence on putting only Thunderbolt ports on the Mac. Which of course use what connector? USB-C.
People need to figure out what they are bitching about before just mouthing words about dongles all the time.