Can I retrieve list of alerts shared in App level, Is it possible?
|rest /services/saved/searches
| search eai:acl.app=my_app eai:acl.sharing=app
| fields eai:acl.owner eai:acl.app eai:acl.sharing search title cron_schedule description
Your search should have given you the results. Anything unexpected happens when you run the search? The most I can think of is to search for only scheduled and enabled searches.
| rest /services/saved/searches
| seach eai:acl.app = myapp eai.acl.sharing = app
is_scheduled = 1 disabled = 0
| fields eai:acl.owner eai:acl.app eai:acl.sharing search title cron_schedule description