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
Joseph's solution above is a great workaround. Also wanted to note that the same method works in the hint column in case that's better for your formatting use case. (E.g. so the "required" star doesn't appear after the image.)