If free will is a measure of what you, as an individual, will choose, then I don’t think it really matters if that “choice” is the result of a deterministic system.
It’s still the output of the entity that is you. It’s still the result of your unique existence, and so it’s as much a choice by you as there could be.
The suggestion that free will could exist beyond this, essentially supposes that there is some entity that is “you” that exists beyond the unique existence of your body and mind. That there some other entity “driving” things, and that every can’t control anything.
But I think that’s kind of silly. You are the sum total of your existence, there’s nothing beyond that. So if every choice you make is the result of that existence, then it’s as much a result of “you” as possible.