Can I deliberately make a long way back?

A* Pathfinding Project is in use
For example, if you have a car 1 and a car 2
I want car 1 to go around the distance and car 2 to go the shortest distance
What should I do?

No, the package will always find the shortest path. Though, you can apply tags/penalties to change what it interprets as the shortest path. See Working with tags - A* Pathfinding Project