Don't know if this helps, but it was previously said that an issue with importing Epic Game Launcher games was that you couldn't launch them from outside the Epic Gasmes Launcher.
Turns out there is a way, if you add the command line argument -EpicPortal To each game in the launcher.
I have Epic support basically finished so there's no need to analyze it any further.
Released in 4.70
Just updating this:
The "-EpicPortal" argument didn't work for me but making a desktop shortcut through the Epic Launcher and using the URL it contains did, e.g. World War Z gave me "com.epicgames.launcher://apps/Wombat?action=launch&silent=true"
We already use com.epicgames.launcher URLs to launch games.
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I have Epic support basically finished so there's no need to analyze it any further.