Use thumbnail or image or both in a document library, for tile view improvement?

Hi community friends,

I am working on a SharePoint Online document library, which consists of files and links. When using the thumbnail (thanks to Mark Rackley  for a great video on easily displaying the thumbnails (https://www.markrackley.net/2020/05/14/view-document-thumbnail-in-modern-document-library-view-in-sharepoint-online/)), the issue is that when the "document" is a link, there is no thumbnail except the url-icon. It would improve the user experience to have the possibility to add an image for the link. It is possible to add a column for picture, still, this doesn't show when using the tile view. 

Anyone who has an idea how to resolve this, with no-code/low-code? 

URl and ppt thumbnail