Not very well. See link below for game benchmarks for the Intel HD 620. The laptop used to benchmark GTA V has a Core i7-7500u. Click the 22.8 FPS number to see some of the laptop's specs.
https://www.notebookcheck.net/Intel-HD-Graphics-620.172256.0.html
Here is a video of GTA V being played on a laptop with a Core i3-7100u and Intel HD 620 which has 12GB of RAM. It shows an average FPS similar to that of the i7-7500u and 8GB of RAM. But it did show that the Core i3-7100u was bottlenecking the game in that laptop. What would the FPS be if that laptop had an i7-7500u and 12GB of RAM? I don't know.
https://www.youtube.com/watch?v=7MV-C3dzmgU