Standard form in Enfold divided in 5 columns

Hi there,

Is there a way to have the default form in the Enfold theme to divide a row into 5 columns?
Now it’s only possible to divide a row into full, 1, 2,3 or 4 columns (or combinations), where in my case I’d like to have 5 columns in a row.
Thought someone else might have dropped this same request but was unable to find one.
In my opinion, two files need to be modified (in the child theme). Namely functions.php to make it possible to select the new 1/5 option in the form creator and secondly the stylesheet to define the new width of the column.

Thanks in advance,
Jan