How to not listed in help

I am trying to get some text underline or bolded in an existing word templated that I feed data into using the aspose.word function createWord(FieldName, FieldValue). It is not translating the html tag as bold and underline in the field value that I feed in to the word document using aspose.word. How can I get my existing word to bold and underline when I feed it in? I am using mail merge fields.
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Hello

Thanks for your request. I think information provided here will be useful for you:
https://reference.aspose.com/words/net/aspose.words.mailmerging/ifieldmergingcallback/
If you have any further queries please feel free to ask.
Best regards,