Install the HA Companion app on your phone (I use the “minimal” one.from FDroid), and enable the Alarm Sensor - that provides the next alarm time (so, be careful if you have different alarms throughout the day!)

Then, I use that time to trigger the lights to start ramping up about 30mins beforehand.

Also… be careful to check if you’re at home… took me a while to realise the lights were coming on whilst we were away.

Oh, and I use Simple Alarm Clock - also from FDroid - because it fades in the alarm sound.