There are a lot of SmartThings provided ‘template’ SmartApps, but you can’t find them in the new SmartThings Connect app, nor are a lot of them shown in the old SmartThings Classic app either.
To access SmartThings home grown SmartApps, log into the ‘SmartThings Groovy IDE’ on the web, then select ‘SmartApps’ under ‘Developer Tools’. Now hit the ‘New Smartapp’ button, then select ‘From Template’ and you’ll see a lot of SmartThings home grown SmartApps.
One of them is called ‘Notify me when’ which is what you are looking for. After selecting it, scroll all the way to the bottom and select ‘Create’, and then ‘Publish for me’ and then you’ll see it available in the SmartThings app SmartApps area after you tap the ‘+’ and it’s listed under ‘Custom’.