Stagger items within a scene

Is there a way to stagger items coming on or going off within a scene? Or even to get lights to gradually become brighter or dimmer?

My partner would like to have a way of getting lights to go off in a delayed manner if they issue a good night command (we use google nest devices for voice control).

Not sure within a scene, but you can create something like a scene with either webCore or Sharptools Rule Engine. Basically, you list commands to turn on/off devices separated by delays. Use a simulated switch to kick it off.

Sharptools Rule Engine also has support for gradual dimming/brightening.