I want to be able to add a numeric value (or two) to each temperature entity that can be used as a level checker so that a notification can check that value instead of a set value. This would allow me to have group checking or display with auto-entities do each check with a different alarm level. Can we add metadata or attributes in a way that allows this.
Not 100% sure what you are asking but you can add custom attributes to entities with Customize.
See: https://www.home-assistant.io/docs/configuration/customizing-devices/#manual-customization
The attributes you add can be anything, not just the ones listed.
thanks I will give that a shot and see if it works for what I want.