[Linux Mint] How to assign AppImage Icons for panel?

[Ao1Pointblank]

Since each instance has its own appimage, and appimage icons are normally set by a .desktop file, does this mean that I must manually create a .desktop file for each instance I make?

example file for official release of ES:

#!/usr/bin/env xdg-open
[Desktop Entry]
Name=Endless Sky
Exec=/home/pointblank/.local/opt/endless-sky-x86_64-v0.9.16.1.AppImage
Comment=Space trade / exploration game
Terminal=false
Icon=endless-sky
Type=Application

Can these be auto-generated upon creation of a new instance? if the endless-sky icon is missing from the user's icon pack, then one from the launcher can be used.