How do I embed an image in an automated notification

Hi all. Any guidance is much appreciated.

We send an automated Request an approval notification once a row is added to our sheet. Our customers are not Smartsheet licensed users or connected users, and we do not want them interacting with our sheet. We would like to include an image, the same image for each request, in the Request an approval automation. Is this possible? I've seen similar questions asked dating back to 2020 so I'm hoping Smartsheet found a solution.

More details about the image - using Generate document or an editable pdf will not work for this workflow/use case.

Thank you for your guidance!