There is commercial software-- Phone View--that does what you want fairly easily.

If it is really just a photo or two that you want, e-mail them to yourself, retrieve them through the Mail app on your iPhone and then you will have an option to import them into the iPhone Photos.


On a Mac since 1984.
Currently: 24" M1 iMac, M2 Pro Mac mini with 27" BenQ monitor, M2 Macbook Air, MacOS 14.x; iPhones, iPods (yes, still) and iPads.