Anyone here having experience of attaining stream entry with choiceless awareness?

If so, I would appreciate some details about the nature of the practice and how it went

PS: I am not talking about noting whatever arises in awareness

I was doing something like that at one point. It's in chapter 13 of the book. Also see chapter 8 of Ozay Rinpoche's book, which describes a practice that developed with no formal instruction at all.