iPhone 8 portrait mode?

I said Portrait Mode is available only on iPhone 11, iPhone 11 Pro, iPhone 11 Pro Max, iPhone XR, iPhone XS, iPhone XS Max, iPhone X, iPhone 8 Plus, and iPhone 7 Plus.

Taking a selfie in Portrait mode requires iPhone X or later. Learn how to identify your iPhone.

See the pic below for Camera Spec

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I am sorry I did not understand it earlier.

The reason that the iPhone 8, 7 and SE doesn't have Portrait mode is because it doesn't have dual cameras. The dual cameras can be found on other iPhone models, such as the iPhone 7 Plus, the iPhone 8 Plus and the iPhone X and the iPhone XS Max and iPhone 11 and later models

Now you have the answer; It can never have Portrait mode unless the hardware is changed.

You can use Portrait mode on iPhone 11, iPhone 11 Pro, iPhone 11 Pro Max, iPhone XR, iPhone XS, iPhone XS Max, iPhone X, iPhone 8 Plus, and iPhone 7 Plus. Taking a selfie in Portrait mode requires iPhone X or later. Learn how to identify your iPhone.