I'm gonna say: no. Not through a Motion template/title. Margin controls cannot be keyframed or "automated" (I tried rigging them, simply no response in FCPX to control changes).
You can, however, use a Title that is in Paragraph format (when you double click on the text in the canvas, you'll see a rectangular "container" and a Ruler over the text [IF the ruler control at the top right of the canvas is turned on].) Type out all your text. Every 10-20 frames (Shift -right arrow for 10 at a time), cut the Title and reposition the margins to group the words to a new wrap. Repeat until finished (shouldn't take long.)
The Custom Title is NOT in Paragraph format. One of the simplest "paragraph" format built-in titles is Lower Thirds > Upper. You can use the Margin control points to reposition the text anywhere you like. If you have Motion, create a basic Title project and save it. You'll get a Paragraph format "lower third" of plain text, no frills. If you need some of the effects Custom can give you, you can add Sequence Text controls (or pick one of the pre-built text behaviors to animate the text.)
HTH