Look at the above screen shot. You will see notifications on the Twitter app, and on the folder above, which when opens shows a notification for Pocketcasts.
To achieve the above you need to download Nova Launcher, buy Nova Launcher Prime and Missed it. In Nova Settings, Unread Counts, change the Provider for Missed it. In the phones settings app, go to accessibility and turn on Missed it. Go to the Missed it app and select all the apps that you want badges to show. The proviso is that badges only show for apps that send notifications to the status bar.
I must admit it has been refreshing using Nova Launcher instead of Apex Launcher, but I do prefer the one setting on Apex that allows for the status bar to match the wallpaper. Also Apex allows individual resizing of icons for the dock, folders, and homescreen. But Nova allows the clock to be removed from the status bar, has alternative folder styles as shown in screen shot and allows integration with Missed it. For a number of the advanced features you need to have rooted your phone.