Hi,
I am trying to assign the current user to a custom Text Field (read-only) in my workflow by adding below in the post functions of my transition.

However, the result is different (see below). The value of the current user becomes a hash value.
Actual Result:

Expected Result:

May I know if how can I achieve the expected result? Is there any other way to do this in a custom Text Field (read-only)?
Thank you.