Triggering a automation from a time slot entity

I have a givenergy solar system and use HA to monitor and control it.
I can use the slot 1 start and end times to get a charging schedule to work, but I’m trying to use the “slot 1 charge end time” to trigger an automation, when charging finishes, but cannot find a way to do it.
This is the entity

It’s probably quite simple and obvious but I can’t seem to get it to work.
Have also tried using other entities like grid power which will change when charging stops but again no luck.
Any help would be appreciated.