A: yes there are 2 ways:

1. For our autogenerate visual maps - you can add the ad graphic as a custom screenshot like so: https://support.visualsitemaps.com/en/articles/4296952-how-to-edit-a-sitemap#h_61149400e2

2. For our FLOWs - just drag and drop any graphic onto the canvas.
https://support.visualsitemaps.com/en/articles/6477269-how-to-use-flows