Import survey as TXT and add HTML to customize text

I’m importing a survey as a TXT file and want to add HTML elements to customize the question description. According to https://www.qualtrics.com/support/survey-platform/survey-module/survey-tools/import-and-export-surveys/#PreparingAnAdvancedFormatTXTFile, it says it’s possible to apply HTML coding into TXT. I specifically want to bold certain parts of the question in my survey to make it easier for a user to read.