You could create a table with the explanation texts. Then create an expression column that points to this table. In subject set the width and label for this field to 0 and field no places further to 0. Then this field will show as a lookup magnifying glass only, that will point to the help text. Make sure this expression kolom is directly behind the field you need to explain. 

This is however a lot of work if you have a table with 60 columns. So if this something you do regularly feel free to add a wish to make a checkbox in subject that will point to a specific help text (f1).