I have a slight hunch this is an Elseworlds story. From what I can vaguely remember, Hugo Strange is Batman. He hires boys and girls to be Robins. I think this a slightly older comic maybe around 2010s or before (not sure).
Sorry for the lack of details, it has been a long time since I read it.
Note: I'm not really sure if Hugo Strange was batman. The main highlight was that there were several Robins. (not the ones we're familiar with)