I think Bradshaw's book is good for many things.
The book: Perfect Daughters (Robert Ackerman) doesn't so much talk about scapegoats, but he talks about personality traits and characteristics with several descriptive checklists. (And, yes, I'm a guy who has the book!) :-)
I think it's been discussed here in several discussions here, including some that talk about how certain traits seem to correlate with one's birth order that include this topic.
Searching sometimes isn't easy, but here's a few I found by searching for "scapegpoat," then looking for this forum or the "Friends-Family-Alcoholics" forum.
https://www.soberrecovery.com/forums...hood-mine.html (My sister's childhood, and mine...) https://www.soberrecovery.com/forums...-question.html (Hey, trusted friends, I have a question) https://www.soberrecovery.com/forums...-step-one.html
Mike