Index F&O are cash-settled. As the option has expired ITM, it’ll be settled at intrinsic value (Spot price - Strike price). Taking the above example, the 19200 CE will be settled by the exchange at Rs. 31.45 (Spot price (19231.45) - Strike price (19200)).
The difference between your buy/sell price and settlement price will be your P&L. More details here: What happens if I don't square off my positions in options? - #2 by ShubhS9