New app mod for Assetto Corsa adds an app named "Who is Before & Behind App". This app provides detailed information about the two cars directly ahead and behind you on the race leaderboard. It shows their positions, the gap between you and them, and how many pit stops they've made. Additionally, it displays their status, such as being stopped on the track, in the pits, retired, or their lap times.
All credits to: sprinteron