Bolding might be tougher. I don't know of a way to write a paragraph and apply formatting within the paragraph. You could try writing in two parts using WordTextWriter. Create a style in your template for the bold text, then another style for the normal text. Set the correct style parameter on each part, and use Placement :After parameter to make the strings follow in the right order.
Hope this helps.
Chris Palmatier Customer Success Engineer Inventor Engineer-to-Order