Yes this is possible. It is mentioned in Swift Documentation. See the 1st link below.

As far as I know, there is no official code style guide provided by Apple so I can't tell you for sure whether it is standard or best practice. According to above mentioned documenation it is opportunity rather than obligation.

Just my experience:

• I've been taught to omit "return" in one-liners at the iOS course
• Paul Hudson and John Sundell has similar articles about it, but they say "you can omit..."

I think this is the subject for regulation in particular company.

• https://docs.swift.org/swift-book/LanguageGuide/Functions.html
• https://www.swiftbysundell.com/questions/when-can-the-return-keyword-be-omitted/
• https://www.swiftbysundell.com/tips/omitting-the-return-keyword/
• https://www.hackingwithswift.com/quick-start/understanding-swift/when-is-the-return-keyword-not-needed-in-a-swift-function

Speaking of just coding this is really 8 kyu :)