Are iTunes Extras for movies available through the AppleTV+ app on Roku?

Unfortunately not.

If you can't view your iTunes Extras - Apple Support

→ “iTunes Extras aren't available in the Apple TV app on smart TVs and streaming devices.”

brad83 Said:

”apple tv+: Are iTunes Extras for movies available to access through the AppleTV+ app on Roku?”

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Does this Work for You:

Use the YouTube App on your AppleTV, and see if you can watch iTunes Extras off of YouTube. It is, after all, using your AppleTV.