EnCh - Entity Checker Need help


I am looking for a way to get notification if a battery powered device is not responding for lets say more then 24hr.
I found this automation in HACS “EnCh - Entity Checker”.
I am new to HA and not sure how to set this up.
In the automation page i see i need to configure some things in the apps.yaml.
But i can not find this file in the config folder (using “studio code server”).
Do i need to add this file to the folder 1st ?

Any better idea on how to get unresponsive battery powered devices notification ?