How to process each field in SonataAdminBundle list view?

How to process each field in SonataAdminBundle list view?

How to apply some code to each entity being displayed in Admin's list view?
For example, if I have a TagManager and need to load tags for each entity
being displayed, how do I do that? Is there a method to override in
entity's Admin or can I bind to some list form event? I could not find a
place to do that.
I don't wan't to bind to entity's onLoad event.