Originally Posted by Moonshine

You could use (insert) a Left Bracket ‘Shape’ and change the weight/colour to your needs, resize if necessary and manipulate it with the ‘yellow’ handle so that it has a square side, top and bottom.
Then copy it, then paste back into the document.
Position the pasted bracket so it is directly over the original, then pull the handle across so it changes to a Right Bracket. Align as nessesary.
Select both left and right brackets and r/click > Group. Change the wrapping to Behind Text.