So it will appear in Lists tab, and there is 3 button
The first one will be the alias command, for example we put here gmc
The second one will be the actual command, for example we put here gamemode creative

And also maybe we can add parameter?
for example
The first one is gmc [<player>]
and then the second one is gamemode creative [<player>]
Maybe something like that?

FYI [] is optional, just like regular Minecraft command