Smartthings itself does not have a built-in NFC feature. Apple HomeKit, however, does, so, if you set up a HomeKit home, you can then read an NFC tag and do something with that. I find the easiest thing is to use a Meross Smart plug or power strip as a go-between between homekit and SmartThings, since the Meross is visible to both platforms at the same time. And it ends up being a pretty inexpensive way to do it. So, for example, scan the NFC tag with your iPhone, turn on a socket in the Meross power strip, have that socket coming on trigger events in smartthings. Here are more details on that method:
And here’s how to create the automation in HomeKit: