How to add text for autofill, as shown below, the part "Tells the element to activate itself ...",

This is what I have

But the "This is a test" part is not displayed when autocomplete,

Please do not make links to other posts that tell you how to write comments so that they appear in the window that appears with Option + Click, I know how to do this. My question is about comments appearing in the autocomplete window.
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