Expo admob link is here. As you can see that they say " Expo includes support for the [Google AdMob SDK] for mobile advertising" but actually they wrapped react-native-admob which has not support for Ad Targetting so using this lib for child is a dead-end. There is another option in the link. However, I think it also has some negative. Also, actually I don’t know that it will work with managed-workflow.
Thanks.