Report Junk NOT available in iMessage

Apple says I can report iMessage junk, but I am NOT seeing Report Junk option in the messages. How do I access it? (I have filtered unknown senders by doing this: Messages>Unknown & Spam, but I am not seeing the Report Junk option anywhere.)

"Report spam or junk messages

With iMessage, a message you receive from someone who isn’t saved in your contacts might be identified as possible spam or junk. You can report these messages to Apple.

In the message, tap Report Junk, then tap Delete and Report Junk.

The sender’s information and the message are sent to Apple, and the message is permanently deleted from your device.

Note: Reporting junk or spam doesn’t prevent the sender from sending messages, but you can block the number to stop receiving them."

Block, filter, and report messages on iPhone - Apple Support