Matrix Table's Text Entry Custom Labels per Column

Hi there, if you still need, I found a thread that I think will be helpful to you. In that, TomG provides some JS that will do what you are describing, where c4 is the 1st column, c5 the 2nd, c6 the 3rd, and c7 the 4th. Adapted for your question, try adding the below code to the OnReady section of your Matrix question's JavaScript:
function hasClass(element, cls) {
        return (' ' + element.className + ' ').indexOf(' ' + cls + ' ') > -1;
    }

var inputs = $(this.getQuestionContainer()).select('input[type="text"]');

    for (var i = 0; i < inputs.length; i++) {
        var input = inputs[i];

        if(hasClass(input.up(), 'c4')) {
            $(input).insert({after: 'CHWs'});
            input.style.display = "inline";
        }   
        if(hasClass(input.up(), 'c5')) {
            $(input).insert({after: 'CHWs'});
            input.style.display = "inline";
        }   
if(hasClass(input.up(), 'c6')) {
            $(input).insert({after: 'CHWs'});
            input.style.display = "inline";
        }  
if(hasClass(input.up(), 'c7')) {
            $(input).insert({after: 'FTE'});
            input.style.display = "inline";
        }  

    }