Underlining a Single Word within a Text Field in Acrobat DC

I would like to know if it is possible to underline a word within a text field. In my example below I want to underline the word MINOR: only.

This is my coding:

event.value="MINOR: " + this.getField(“BName”).valueAsString;

I want the above to look like this:

MINOR: Jane Doe

Is this possible?

Thank you