How many applications are there available in /e/ OS?

For this limited purpose you don’t even need a different OS, you can stay on your stock OS.

In Android you can uninstall any App (preinstalled ones, too) for the current user, which makes the App effectively gone.
You would need the Android package name of the App for this, but you can look those up in the Play Store or in a ton of bloatware lists out there in the internet.

I did it myself this way with the stock OS on my Fairphone 3 before I switched to /e/, as well as on a Samsung phone at work.