How do I un-delete an app icon in BlissLauncher?

For reference, BlissLauncher is the default launcher of the /e/ Android-based OS a.k.a. eOS, installed by default by Murena on their Android phones.

Just recently I grabbed my phone and apparently had my finger on the screen, so the display switched to "alter icons" mode where they wiggle and you can move them around. I inadvertently removed an icon which proudly notes how you can remove and icon from a non-system app by clicking the circled-minus "⊝" button. However, nowhere can you find how to add an icon for an already-installed app.

As best I can tell, you can't. Unless you're a software developer and can alter the configuration files.

It's so stupid: you have to uninstall the app then reinstall it.