Using F function into annotate

Question

i have a problem about using f function into annotating i use F function to retreive "user__id" and pass it to get_user_daynum that it should returns a number but it always returns a same number. after that i filter them by creating a lookup_field. i test the get_user_daynum many times and i get correct number but about using it in annotate i'm confused.

 for date, days in valid_date_days.items():
        lookup_field = f'{date}__in'
        intended_user_workpattern = intended_user_workpattern.annotate(
            **{date: Value(get_user_daynum(date, F('user__id'), request_user_wp.work_pattern))}
        )
        intended_user_workpattern = intended_user_workpattern.filter(
            **{lookup_field: list(days)}
        )