I was looking for solutions to aligning and resizing an embedded image when I ran across your question. I realize your question is nearly 4 months old, but I believe I have a solution for you.
Survey123 Connect supports HTML formatting in the "label" column. I used the img HTML tag, added my parameters, and it WORKED! I attached an image.
the code is as follows (provided the image file is saved in the media folder of your Surve123 project) :
<img src="fileName_as_it_appears_in_mediaFolder" alt="Alternate Name" width="0000" heigth="0000" style="align">
I Hope This Helps