I\'ve seen some questions and answers about custom events for firebase analytics, but i just wanted to ask you a straight question so you can give me a straight answer :)
Not only do you need to do what Muhammad Riyaz says, you also need to get your user count up above the "threshold". In my case, installing my app on a dozen simulator versions pushed my user count to 12, and voila, suddenly I have custom event parameter data in my Firebase dashboard.