Could you just try surrounding the text with <b> and </b> html tags? I don't know if it will work, but it's worth a try :)
Just to clarify your question a bit : you have a custom text field and you want the default text for this field to be bold, am I correct?
Never tried this before, but perhaps you can include some JS code in the customfield description to access the document.getElementById, and make it bold
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