As Xara use SPAN for text lines, the immediate answer is no. If,however, you select the text in a block and add the Name htmlblocktext, it is changed to a DIV of wrapped text.
Add a link to this offers a better presentation but every word is underlined unless the website default link setting are changes and this might impact elsewhere. It might impact line spacing too.
I chose the box overlay as this is cleaner but the OP has to advise what effect is being sought.
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