Hello,
In order to convert the HTML content to plain readable text you will have to add some code (and so use a Sirius Service call to populate the content of your table cell).
A simple solution is probably to use a regular expression to modify the text and remove the html tags (<…> content).
An other solution may be found in a simple override of the HTMLEditorKit ParserCallback as in https://stackoverflow.com/q/3911385/9099694
Edit: I found that an other post have an answer for you: Convert Rich Text of description in plain text
Regards,
Arnaud