Grid renderer?

How I can render 2 fields of model in one column? For example I have model with fields “Name”, “Surname”. How I can join this two fields (with string separator) and show in one column.
P.S.: In ONE column, with ONE header

If you need the column to be editable then things will get tricky, but not impossible, I guess.

If not, the case is simple. Either do the concatenation in your SQL SELECT or - if you can’t then - create a new
Generated column
which is the concatenation of the two values and then hide the columns for “Name” and “Surname”.