Speaking purely technically, no, this is not supported in Swift.

If you do really want to achieve this, you can approach it in the following way:

Read Only

var content: String {
    return m.content
}

Read/Write

var content: String {
    get {
        return m.content
    }
    set {
        m.content = newValue
    }
}

All of this though, should have you asking, do you really NEED to do this? Does this really give you anything that just accessing m.content directly wouldn’t already give you?