Why the Gmail subject line not shown on my Iphone when I have Gmail notification on?

I switched from Android to Iphone 15 recently. Whenever a new mail comes in, I got a notification as "You have a new message." Then I need to unlock my phone to open Gmail to get further details of the mail. While using Android, the mail notification already includes the subject line of the mail so I dont' have to open my Gmail to get the details.

Any way to get the subject line of the mail included in the notification? Thanks