Of course this is still a Beta so this feature may not be available when officially released.
Motherboard reported that the Beta versions of iOS 11.3 and 11.4 have this feature, but until the official release is not available. Although just released, iOS 12 Beta is praised with many new features useful and stable operation.
Don't forget to follow iOS 12 related tutorials on TipsMake.com to not miss the news.
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