Most people use the life 360 app for this purpose. It’s a free service and there’s an official integration with SmartThings.
Alternatively, you can use IFTTT presence and have it turn on a virtual presence sensor through the SmartThings IFT TT service/channel. The difference between this and the life 360 is that life 360 does allow you to track the other person throughout the day, and that might be too much information, say for a housemate situation.
The IFTTT alternative requires a little more set up, but you can just get a report at a specific location, like now arrived at the house. You don’t get the whole tracking thing.