How to properly add notification icons to the ios and android application?

Question

Mobile development

Tell me, you need to add an icon with the amount of new information in this menu item in the application menu.
For example, as in the arrow application

Example

On androids, I see they use a red square and inside the number of notifications, on ios I have not yet seen with my eyes how they do it.
So far I see only 1 option to add 10 pictures with numbers from 1 to 10+ and display them depending on the number of notifications, but it looks strange.
Can you tell me if it's worth doing this or are there some life hacks about this?

Answer 1

this is called a badge.
Yaos itself draws them on the icon. I think on a bucket similarly.

on ios, I have not yet seen how they do it

sure, not a problem