Use SendGrid for Server Notification Emails for WHM/cPanel on Google Cloud

Hello, Can anyone please help?... How to use SendGrid on the server WHM/cPanel (use Google Cloud) - so server notification emails (eg new cPanel account etc) is using SendGrid (not "PHP SendMail) ? I am aware that Google Cloud blocks port 25 so we have to use provider like SendGrid for any outgoing emails. I managed to use SendGrid as "Smart Host" for outgoing email (from email accounts inside each cPanel accounts) - but not server notification emails Thank you Ferdy