They do have trackers in the ball but I think it's used more to determine speed, how far the ball traveled, etc. But doesn't seem that big a leap to use it for spotting the ball.
A tracking system is installed in every NFL venue which is composed of:
20–30 ultra-wide band receivers
2–3 radio-frequency identification (RFID) tags installed into the players’ shoulder pads
RFID tags on officials, pylons, sticks, chains, and in the ball
https://operations.nfl.com/gameday/technology/nfl-next-gen-stats/#:~:text=A tracking system is installed,chains%2C and in the ball