How to change “Type here” in survey

1) Navigate to JS editor in the survey: Design->JS

2) Paste the following code in the editor field:

requestAnimationFrame(function () {
document.getElementById("question-0").placeholder =
"Custom type here";
});

Example:

3) Replace 0 in "question-0" with respective question_id

4) Replace Custom Type here with any other text 

5) Save and test the code 

Output :