This App will send all your configured notifications to your Amazon echo.
Enable the Skill at Alexa App.
Try with "Alexa ask Notif for notifications"
First time the Skill will show you a card with a UserId, Copy it and Paste it at settings / UserId box.
Give the App permission to read your notifications.
There are a lot of options on the App. Try them.
You can configure the App to delete every message at server once you've read it at mobile.
Messages are kept at server only for 2 days maximum.