Arriving on Android is Gmail's really useful unsubscribe button. Whenever you get an unwanted Temu email, just click the button next to the sender's name at the top of the email to unsubscribe without ever leaving it. When you click this button, Android Authority discovers that you either automatically unsubscribe or go to the sender's website to perform the magic. Users may or may not have the functionality yet since it is presently being gradually rolled out. Make sure the Gmail app on your phone is updated, and then wait a few days if you still don't see it.
The three-dot menu at the top of the page may be tapped to unsubscribe if you don't already have that choice. Options to label an email as spam or phishing are still available on the same menu. If you do that, Google will be notified that the sender may have had malicious intent in addition to displaying an unsubscribe option.