How to display an input select with all (or filtered) entities?

[VDRainer]

Here’s something that i use for this.

Fill Input select

Hi, I’m trying to make an automation, so when HA starts, it fills an option select with all the entities that belongs to a group. I’m trying with the lights_all group, but it cloud be anyone. The idea is that when I include an entity in this group, it automatically appears (after reboot) in all the input selects that I want . Can anybody help me?