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Age of Empires in GG is a bit of an ask. It may be able to do it, but you will be doing all the work yourself and practically disabling most of GG;s features.
Getting people to stand idly though is fairly easy. Just make a basic script to animate them. CHeck out the AI_viewanimations for the best way to do it (others are simpler but full of bugs!)
Oh I did do a couple of AI scripts that are getting old now, but still have "basic citizens who walk around"
This one is the the modern soldiers rather than the medieval ones.
Both on the Store!
Don't ask me why they don't want to embed, but not gonna spend more time on it!
SPECS: Ryzen 1700 CPU. Nvidia 970GTX. 16 Gig Memory. Win 10.