Can you upload a list of email contacts for a notification email?

I want to send the notification email to a group of 500 people. Is it possible to upload a group of emails. 500 is too many to individual type in

Unfortunately, that is not possible at the moment. You can add up to 10 recipients only per notification. If you need to list more than that then create another notification for another email address.

What I suggest is to purchase an email forwarder or get an email service where you can receive the email at a specific email address and it will send all the emails that are received to the listed recipients.