Fade out light slowly - automation

I can’t find anything on this on Google, so i’m trying my luck here.

I use the Shortcut app on my iPhone to turn my light on and off. I would like a third shortcut on my phone that would slowly fade out the light from the current state to completely off in like 30 minutes. I know there is some automation feature in the Philips Hue app, but it can only be done so the light would start to fade out at a predetermined time off the day.

Is there no way to make a routine/schedule that i can start, that would do this?