Should I tell Muslim customers the pastries aren’t halal?

Assalamu alaikum, I work at a bakery in a place where Muslims are a small community. We don't label anything as halal or haram. I often see sisters come in and buy pastries that have alcohol in the filling, or bread made with lard, and sweets with pork gelatin. It's not obvious at all, so they can't be blamed for not knowing. Halal options are really hard to find around here, and I just want my brothers and sisters to enjoy treats without worry. I'm torn-should I tell them and risk making things hard, so they have to seek forgiveness, or let them be unaware? What’s the right thing to do?