Requests history display expressions

Hi all,

In UA (4.6.x) under requests history, we can see the flow/approval etc. steps.
When for example a user approves, we see that users full name.
We've made a custom effective class, and a coresponding DAL definition.
What we see regarding those objects in the history, is their full DNs, typeless ndap notation.
Is there a way to get a more user friendly display expression for this type of objects in the request history for such an object.

See the picture here

https://ibb.co/noNbao

-Carsten