Sure it is.
You spawn the enemies and a smoke VFX and print the text “Bandits ambush you!” just like we currently get with the void monsters.
I’m not saying to make enemies visibly crawl out of the scenery, I’m saying to give a more fitting in-character explanation for spawning them.
And since the void monster spawn on opening random loot containers works pretty much exactly like this except globally, programming/coding wise this should be possible. Make a new fancy looking chest asset, attach the spawn-cronley-gang script or however their internal engine handles this, and assign some spots on the cronley maps to spawn these ambush chests.