Display in RMA

This is a matter of formatting, and you can put HTML formatting directly into the Display Area of a template to give instructions on how it should look.  So I would suggest doing something like this for the individual rows of your text box:

<tr style="border: 1px solid black;"><td width="200" style="border: 1px solid black;"><Characteristic></td><td width="100" style="border: 1px solid black;"><Characteristic Value></td></tr>

where <Characteristic> and <Characteristic Value> are the placeholders for the values you are showing.  This not only gives you the spacing, but puts a border around each row and cell as well.  It could take some tweaking, since the use of a count of 1 or more is going to enforce some extra icons to appear.  In the placeholder for the "1 or more" item, you can also check out that there are multiple choices for the UI layout: default, table, and tab.  The table choice may give you something closer to what you want to start, but it also could conflict with specific HTML tags you set up, the tabs choice makes it so rows can be hidden or shown, not really hopeful for your use case, but something to keep in mind.