I have not called you in this way. haha... ( E.g. Usually, I call her YYY but it's the first time I emailed him, so I called him XXX).
I think 'in this way' sounds most natural to me but then the song hit me - I want it this way.
Is the preposition 'in' necessary? this way can well function as an adverb on its own?
At least in AmE the preposition in is usually unnecessary. This way can and often does function as an adverb on its own.
1) You can do it this way or that way. (Actually people would normally say You can do it either way, but the example still parses and is idiomatic.)
2) I refuse to respond at all. This way, nobody can accuse me of favouring one side or the other.