In sulu you are doing this not on a row level. Instead on a column level on a column level you have different "list transformers" you can create own list transformers as shown in the Sulu Demo here:

https://github.com/sulu/sulu-demo/pull/80

Or use existing list transformer. One option would be the "icon" list transformer.

As example the activity log icon: https://github.com/sulu/sulu/blob/2.6.6/src/Sulu/Bundle/ActivityBundle/Resources/config/lists/activities.xml#L36-L80