Ah, that clears it up. Well... I am going to go with maybe. Why? It depends on the game's online structure, car list, and track list.
If the the lobby setup is like GT6, then yeah, it's probably possible to roleplay. But since this is a different kind of Gran Turismo (as in, more aimed at e-sports,) no one knows if we will be even be able to create out own lobbies and if so what will we be able to change.
At the time of launch we're supposedly getting 140 cars. If you've noticed an obvious trend, it's that it's mostly filled with race cars. I don't know if chasing race cars on a street is your cup of tea, but for me, it is not. So the amount of street cars can make a difference.
There are also 15 tracks planned to be included in the game. Like I've said above, since this a motorsport-aimed title, I would only expect real world racing circuits. Maybe we'll get a few fictional roads but I really would not count on it.
Basically, if you want to do any serious cops vs robbers kind of roleplay, I'd say wait for the real Gran Turismo 7. Hopefully once GT7 is out we can go back to the "open" type of GT we are used to. But seeing how Kaz was stating that GT Sport marks the new era for Gran Turismo, we might not be doing any kinds of cruising, chasing, etc. for a while. We'll just have to wait and see.