Hi Jonathan,

You may use a hidden field for saving the lookup results, and use custom script to update column label based on the field value.

To update the first column label, try script like this (the lookup result field has class "myField" and the table has class "myTable")

$(document).ready(function(){
  $('.myField input').change(function(){
    $('.myTable .cf-col-label:eq(0)').text($('.myField input').val());
  });
});