nasdaq100 p/e ratio during recession , how can we calculate potential levels based simply on that ?

Does anyone know where I can find information on the current P/E ratio of the Nasdaq 100? Also, if the Fed's prediction is correct and we enter a recession in the near future, what can we expect the P/E ratio of the Nasdaq 100 to drop to? Historically, during recessions, the P/E ratio has dropped to 10-15. I am wondering what the potential price of the Nasdaq 100 would be at recession levels. I appreciate any input from knowledgeable individuals.

I know it may sound too simple but taking into consideration nasdaq100 today is at 12890, if the p/e ratio would drop to 10, does anybody know what level the nasdaq100 would be with a p/e of 10 ? if you don't mind can u share how u calculate that ?