Record Summary - Customize layout for subform items?

Record Summary - Customize layout for subform items?

Hello again.
I am fairly close to getting my record summary to look how I want it to look, but there's still one other thing I can't quite figure out how to do...

My record summary is for a form (Form A) that has a multiselect lookup field. The other form (Form B) which the lookup is connected to contains a multiline text field which I use to store the data I want to show as one long string of HTML code.
In the record summary, I added the multiselect field from Form A and select only the big text field to display.
So far, that works perfectly -- The HTML content from the textbox in Form B displays all the aggregated info and looks decent.

But now I also want to display an image or two from Form B as well, below the text. But if I select the images in the related field properties, they go in the same row same row as the text field.
I tried to use the "Edit as HTML" tool to adjust the layout of the items to be like this:
  1. <div style=''>
  2.   <div style='width: 50%; display: none;'>
  3.     <div style=''>${Label element}</div>
  4.   </div>
  5.   <div style='width: 100%;'>
  6.     <div style=''>
  7.       <div style='display: none;'>${Final Report HTML Label element}</div>
  8.       <div style=''>${Final Report HTML Value element}</div>
  9.     </div>
  10.   </div>
  11.   <div style='width: 100%;'>
  12.     <div style=''>
  13.       <div style='display: none;'>${Hidden Report Image 1 Label element}</div>
  14.       <div style=''>${Hidden Report Image 1 Value element}</div>
  15.       <div style='display: none;'>${Hidden Report Image 2 Label element}</div>
  16.       <div style=''>${Hidden Report Image 2 Value element}</div>
  17.     </div>
  18.   </div>
  19. </div>

But it just removes the second <div style='width: 100%;'>...</div> and places all the elements back into the first one.

Is there any way to customize how subform fields are displayed, whether they are in table rows or lists?